Exam 2: Motion in One Dimension

A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 8.00 s.What is the speed after the first 5.00 s of acceleration? (Hint: First convert the speed to m/s.)

In one-dimensional motion where the direction is indicated by a plus or minus sign, the average velocity of an object has which of the following properties?

A ball is thrown vertically upwards at 19.6 m/s.For its complete trip (up and back down to the starting position), its average speed is:

A basketball player can jump 1.6 m off the hardwood floor.With what upward velocity did he leave the floor?

In the case of constant acceleration, the average velocity equals the instantaneous velocity:

A change in a physical quantity w having initial value w_i and final value w_f is given by which of the following?

A baseball catcher throws a ball vertically upward and catches it in the same spot when it returns to his mitt.At what point in the ball's path does it experience zero velocity and non-zero acceleration at the same time?

Displacement is which of the following types of quantities?

A water rocket, launched from the ground, rises vertically with acceleration of 30 m/s² for 1.0 s when it runs out of "fuel." Disregarding air resistance, how high will the rocket rise?

A rock is thrown straight up with an initial velocity of 24.5 m/s.What maximum height will the rock reach before starting to fall downward? (Take acceleration due to gravity as 9.80 m/s².)

A parachutist jumps out of an airplane and accelerates with gravity to a maximum velocity of 58.8 m/s in 6.00 seconds.She then pulls the parachute cord and after a 4.00-second constant deceleration, descends at 10.0 m/s for 60.0 seconds, reaching the ground.From what height did the parachutist jump?

A ball is pushed with an initial velocity of 4.0 m/s.The ball rolls down a hill with a constant acceleration of 1.6 m/s².The ball reaches the bottom of the hill in 8.0 s.What is the ball's velocity at the bottom of the hill?

An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s.If west is chosen as the positive direction, what is the average speed of the object?

A European sports car dealer claims that his car will accelerate at a constant rate from rest to 100 km/hr in 8.00 s.If so, what is the acceleration? (Hint: First convert speed to m/s.)

A drag racer starts from rest and accelerates at 10 m/s² for the entire distance of 400 m (1/4 mile).What is the velocity of the race car at the end of the run?

A ball of relatively low density is thrown upwards.Because of air resistance the acceleration while traveling upwards is -10.8 m/s².On its trip downward the resistance is in the opposite direction and the resulting acceleration is -8.8 m/s².When the ball reaches the level from which it was thrown, how does its speed compare to that with which it was thrown?

A truck moves 70 m east, then moves 120 m west, and finally moves east again a distance of 90 m.If east is chosen as the positive direction, what is the truck's resultant displacement?

An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s.If west is chosen as the positive direction, what is the sign associated with the average velocity of the object?

A strobe photograph shows equally spaced images of a car moving along a straight road.If the time intervals between images is constant, which of the following cannot be positive?

Maria throws two stones from the top edge of a building with a speed of 20 m/s.She throws one straight down and the other straight up.The first one hits the street in a time t₁.How much later is it before the second stone hits?