Exam 2: Kinematics: Motion in One Dimension

To determine the height of a bridge above the water,a person drops a stone and measures the time it takes for it to hit the water.If the time is 2.3 s,what is the height of the bridge? Neglect air resistance.

Which of the following graphs represent an object having zero acceleration? (a) (b) (c) (d)

An object is dropped from a bridge.A second object is thrown downwards 1.0 s later.They both reach the water 20 m below at the same instant.What was the initial speed of the second object? Neglect air resistance.

The figure shows a graph of the position of a moving object as a function of time. (a)What is the average velocity of the object from t = 0 s to t = 4.0 s? (b)What is the average velocity of the object from t = 0 s to t = 6.0 s?

Under what condition is average velocity equal to the average of the object's initial and final velocity?

What must be your average speed in order to travel 350 km in 5.15 h?

A train starts from rest and accelerates uniformly until it has traveled 2.1 km and acquired a forward velocity of $24 \mathrm {~m} / \mathrm { s }$ The train then moves at a constant velocity of $24 \mathrm {~m} / \mathrm { s }$ for 400 s.The train then slows down uniformly at 0.065 m/s² until it is brought to a halt.The distance traveled by the train while slowing down is closest to

An astronaut on a strange new planet having no atmosphere finds that she can jump up to a maximum height of 27 m when her initial upward speed is 6.0 m/s.What is the magnitude of the acceleration of freely falling objects on the planet?

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s².How much time is required for the car to reach a speed of 90 km/h?

A car starts from rest and accelerates at a steady 6.00 m/s².How far does it travel in the first 3.00 s?

The motions of a car and a truck along a straight road are represented by the velocity-time graphs in the figure.The two vehicles are initially alongside each other at time t = 0. At time T,what is true of the distances traveled by the vehicles since time t = 0?

Suppose that an object is moving with a constant velocity.Which statement concerning its acceleration must be correct?

Brick A is dropped from the top of a building.Brick B is thrown straight down from the same building.Neglect air.Which statement about their accelerations is correct?

The figure shows the velocity-versus-time graph for a basketball player traveling up and down the court in a straight-line path.Find the displacement of the player (a)during the first two seconds. (b)between t = 4 s and t = 8 s.

Human reaction times are worsened by alcohol.How much further (in feet)would a drunk driver's car travel before he hits the brakes than a sober driver's car? Assume that both are initially traveling at 50.0 mi/h and their cars have the same acceleration while slowing down,and that the sober driver takes 0.33 s to hit the brakes in a crisis,while the drunk driver takes 1.0 s to do so.(5280 ft = 1 mi)

In a ballistics test,a bullet moving horizontally with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. (a)What is the magnitude of the average acceleration of the bullet in the sandbag? (b)How many milliseconds does it take the bullet to come to rest in the sandbag?

Abby throws a ball straight up and times it.She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.1 s.What was the speed of the ball at as it passed the top of the flagpole? Neglect air resistance.

Which of the following situations is impossible?

The figure shows a graph of the velocity of an object as a function of time.What is the average acceleration of the object over the following time intervals? (a)From t = 0 s to t = 5.0 s (b)From t = 0 s to t = 8.0 s

Suppose that a car traveling to the east (+x direction)begins to slow down as it approaches a traffic light.Which statement concerning its acceleration must be correct?