Question 1

The time it takes a projectile fired straight up at 10 m/s to reach the top of its path is about

Accepted Answer

A) 1 s. 
B) 2 s. 
C) 10 s. 
D) not enough information 
A) 1 s. 
B) 2 s. 
C) 10 s. 
D) not enough information

Question 2

Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite direction. Jake's speed relative to the ground is

Accepted Answer

A) 6 m/s. 
B) 10 m/s. 
C) 14 m/s. 
D) none of the above 
A) 6 m/s. 
B) 10 m/s. 
C) 14 m/s. 
D) none of the above

Question 3

A motorboat that normally travels at 8 km/h in still water heads directly across a 6-km/h flowing river. The resulting speed of the boat is about

Accepted Answer

A) 6 km/h. 
B) 8 km/h. 
C) 10 km/h. 
D) 20 km/h. 
A) 6 km/h. 
B) 8 km/h. 
C) 10 km/h. 
D) 20 km/h.

Question 4

A river 100 m wide flows due south at 1 m/s. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat reaches the east bank

Accepted Answer

A) due east of its starting point. 
B) 100 m farther south. 
C) 141 m farther south. 
D) none of the above 
A) due east of its starting point. 
B) 100 m farther south. 
C) 141 m farther south. 
D) none of the above

Question 5

A humming bird flying at 4 km/h that gets caught in a 3-km/h crosswind has a resultant speed of about

Accepted Answer

A) 3 km/h. 
B) 4 km/h. 
C) 5 km/h. 
D) more than 5 km/h. 
A) 3 km/h. 
B) 4 km/h. 
C) 5 km/h. 
D) more than 5 km/h.

Question 6

A freely-falling watermelon falls with constant

Accepted Answer

A) velocity. 
B) speed. 
C) acceleration. 
D) distances each successive second. 
A) velocity. 
B) speed. 
C) acceleration. 
D) distances each successive second.

Question 7

When a ball thrown straight upwards reaches the very top of its path, its acceleration is

Accepted Answer

A) zero. 
B) 5 m/s2. 
C) 10 m/s2. 
D) none of the above 
A) zero. 
B) 5 m/s2. 
C) 10 m/s2. 
D) none of the above

Question 8

Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, two seconds later the rock's speed is

Accepted Answer

A) zero. 
B) 5 m/s. 
C) 10 m/s. 
D) 15 m/s. 
E) none of the above 
A) zero. 
B) 5 m/s. 
C) 10 m/s. 
D) 15 m/s. 
E) none of the above

Question 9

A ball is thrown upwards and returns to the same location. Compared with its initial speed its speed when it returns is about

Accepted Answer

A) half as much. 
B) the same. 
C) twice as much. 
D) four times as much. 
A) half as much. 
B) the same. 
C) twice as much. 
D) four times as much.

Question 10

Neglecting air resistance, a ball projected straight upward so it remains in the air for 10 seconds needs an initial speed of

Accepted Answer

A) 50 m/s. 
B) 60 m/s. 
C) 80 m/s. 
D) 100 m/s. 
E) 110 m/s. 
A) 50 m/s. 
B) 60 m/s. 
C) 80 m/s. 
D) 100 m/s. 
E) 110 m/s.

Question 11

An apple falls from a tree and hits the ground 5 meters below with a speed of about

Accepted Answer

A) 5 m/s. 
B) 10 m/s. 
C) 15 m/s. 
D) 20 m/s. 
E) not enough information 
A) 5 m/s. 
B) 10 m/s. 
C) 15 m/s. 
D) 20 m/s. 
E) not enough information

Question 12

A cart changes its speed from 90 m/s to 100 m/s in 10 seconds. During this interval its acceleration is

Accepted Answer

A) zero. 
B) 1 m/s2. 
C) 10 m/s2. 
D) none of the above 
A) zero. 
B) 1 m/s2. 
C) 10 m/s2. 
D) none of the above

Question 13

A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the opposite direction has a speed of

Accepted Answer

A) 0 m/s. 
B) 3 m/s. 
C) 4 m/s. 
D) 6 m/s. 
A) 0 m/s. 
B) 3 m/s. 
C) 4 m/s. 
D) 6 m/s.

Question 14

A bird flying at 8 km/h in a 6-km/h crosswind has a resultant speed of

Accepted Answer

A) 6 km/h. 
B) 8 km/h. 
C) 10 km/h. 
D) 14 km/h. 
A) 6 km/h. 
B) 8 km/h. 
C) 10 km/h. 
D) 14 km/h.

Question 15

A car's speed 3 seconds after accelerating from rest at 2 m/s2 is

Accepted Answer

A) 2 m/s. 
B) 3 m/s. 
C) 4 m/s. 
D) 6 m/s. 
A) 2 m/s. 
B) 3 m/s. 
C) 4 m/s. 
D) 6 m/s.

Question 16

Which of the following is not a vector quantity?

Accepted Answer

A) velocity 
B) speed 
C) acceleration 
D) all are vector quantities 
E) none are vector quantities. 
A) velocity 
B) speed 
C) acceleration 
D) all are vector quantities 
E) none are vector quantities.

Question 17

At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is

Accepted Answer

A) 25 m/s. 
B) 50 m/s. 
C) 55 m/s. 
D) 60 m/s. 
E) 100 m/s. 
A) 25 m/s. 
B) 50 m/s. 
C) 55 m/s. 
D) 60 m/s. 
E) 100 m/s.

Question 18

If you throw a ball straight downward (in the absence of air resistance), after leaving your hand its acceleration is

Accepted Answer

A) less than 10 m/s2. 
B) 10 m/s2. 
C) greater than 10 m/s2. 
A) less than 10 m/s2. 
B) 10 m/s2. 
C) greater than 10 m/s2.

Question 19

The muzzle velocity of a bullet fired from a new rifle is 100 m/s. Neglecting air resistance, at the end of one second a bullet fired straight up into the air will have traveled a distance of

Accepted Answer

A) (100 - 5)m. 
B) (100 + 5)m. 
C) 100 m. 
D) 5 m. 
E) none of the above 
A) (100 - 5)m. 
B) (100 + 5)m. 
C) 100 m. 
D) 5 m. 
E) none of the above

Question 20

The total time it takes a projectile fired straight up at 10 m/s to reach the top of its path and return to its starting point is about

Accepted Answer

A) 1 s. 
B) 2 s. 
C) 10 s. 
D) 20 s. 
A) 1 s. 
B) 2 s. 
C) 10 s. 
D) 20 s.

Exam 3: Linear Motion

The time it takes a projectile fired straight up at 10 m/s to reach the top of its path is about

Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite direction. Jake's speed relative to the ground is

A motorboat that normally travels at 8 km/h in still water heads directly across a 6-km/h flowing river. The resulting speed of the boat is about

A river 100 m wide flows due south at 1 m/s. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat reaches the east bank

A humming bird flying at 4 km/h that gets caught in a 3-km/h crosswind has a resultant speed of about

A freely-falling watermelon falls with constant

When a ball thrown straight upwards reaches the very top of its path, its acceleration is

Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, two seconds later the rock's speed is

A ball is thrown upwards and returns to the same location. Compared with its initial speed its speed when it returns is about

Neglecting air resistance, a ball projected straight upward so it remains in the air for 10 seconds needs an initial speed of

An apple falls from a tree and hits the ground 5 meters below with a speed of about

A cart changes its speed from 90 m/s to 100 m/s in 10 seconds. During this interval its acceleration is

A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the opposite direction has a speed of

A bird flying at 8 km/h in a 6-km/h crosswind has a resultant speed of

A car's speed 3 seconds after accelerating from rest at 2 m/s2 is

Which of the following is not a vector quantity?

At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is

If you throw a ball straight downward (in the absence of air resistance), after leaving your hand its acceleration is

The muzzle velocity of a bullet fired from a new rifle is 100 m/s. Neglecting air resistance, at the end of one second a bullet fired straight up into the air will have traveled a distance of

The total time it takes a projectile fired straight up at 10 m/s to reach the top of its path and return to its starting point is about

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A car's speed 3 seconds after accelerating from rest at 2 m/s² is