Exam 2: Motion in One Dimension

A 50.0-g ball traveling at 22.0 m/s is bounced off a brick wall and rebounds at 21.0 m/s.A high-speed camera records this event.If the ball is in contact with the wall for 2.50 ms,what is the average acceleration of the ball during this time interval?

A v vs.t graph is drawn for a ball moving in one direction.The graph starts at the origin and at t = 5 s the acceleration of the ball is zero.We know that at t = 5 s,

A bird,accelerating from rest at a constant rate,experiences a displacement of 22 m in 10 s.What is the average velocity?

An automobile driver puts on the brakes and decelerates from 35.0 m/s to zero in 11.0 s.What distance does the car travel?

The value of an object's acceleration may be characterized in equivalent words by which of the following?

On a position-time graph for a particle,suppose the plot starts at some positive position and as the time goes on the curve gets steeper and steeper while curving upwards.Which of the following must be true?

​Suppose a particle is moving along a straight line with a speed v for a time t,then stops for a time t,and then resumes moving along the original direction with speed v for time t.What has been the average speed of the particle for the total time period 3t?

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?

A parachutist jumps out of an airplane and accelerates with gravity to a maximum velocity of 68.6 m/s in 7.00 seconds.She then pulls the parachute cord and after a 4.00-second constant deceleration,descends at 10.5 m/s for 60.0 seconds,reaching the ground.From what height did the parachutist jump?​

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?

A car is moving in the positive direction along a straight highway and accelerates at a constant rate while going from point A to point B.If the acceleration is positive,increasing the speed of the car,when does the position where the average speed equals the instantaneous speed occur during the time interval from A to B? Assume the time interval is T.

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

Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground.If air resistance is negligible,which statement best applies?

An object is dropped from a height.Once it is moving,which of the following statements is true,at least at one point?

In one-dimensional motion,the average speed of an object that moves from one place to another and then back to its original place has which of the following properties?

At the top of a cliff 100 m high,Raoul throws a rock upward with velocity 15.0 m/s.How much later should he drop a second rock from rest so both rocks arrive simultaneously at the bottom of the cliff?​

A cheetah can maintain its maximum speed of 96.0 km/hr for 26.0 seconds.What minimum distance must a gazelle running 85.0 km/hr be ahead of the cheetah to escape?

A railroad train travels forward along a straight track at 90.0 m/s for 1 000 m and then travels at 70.0 m/s for the next 1 000 m.What is the average velocity?

A rock is thrown straight up with an initial velocity of 17.6 m/s.What time interval elapses between the rock's being thrown and its return to the original launch point? (Acceleration due to gravity is 9.80 m/s². )

In which of the following cases is the displacement's magnitude half the distance traveled?​