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Exam 2: One-Dimensional Kinematics

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Question 1

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An object is moving with constant non-zero velocity in the +x direction.The velocity versus time graph of this object is

A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time axis.
D) a parabolic curve.

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Question 2

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A ball is thrown downward from the top of a building with an initial speed of 25 m/s.It strikes the ground after 2.0 s.How high is the building,assuming negligible air resistance?

A) 20 m
B) 30 m
C) 50 m
D) 70 m

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Question 3

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Which of the following graphs represent an object having zero acceleration?

Two objects are thrown from the top of a tall building.One is thrown up,and the other is thrown down,both with the same initial speed.What are their speeds when they hit the street? Neglect air resistance.

The graph in the figure shows the position of a particle as it travels along the x-axis.What is the magnitude of the average velocity of the particle between t = 1.0 s and t = 4.0 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?

Human reaction time is usually greater than 0.10 s.If your friend holds a ruler between your fingers and releases it without warning,how far can you expect the ruler to fall before you catch it,assuming negligible air resistance?

The graph in the figure shows the position of a particle as it travels along the x-axis.What is the magnitude of the average speed of the particle between t = 1.0 s and t = 4.0 s?

A light-year is the distance that light travels in one year.The speed of light is 3.00 × 10⁸ m/s.How many miles are there in one light-year? (1 mi = 1609 m,1 y = 365 d)

Assuming equal rates of uniform acceleration in both cases,how much further would you travel if braking from 56 mi/h. To rest than from 28 mi/h?

A polar bear starts at the North Pole.It travels 1.0 km south,then 1.0 km east,and then 1.0 km north to return to its starting point.This trip takes 45 min.What was the bear's average speed?

A rock is projected upward from the surface of the Moon,at time t = 0 s,with an upward velocity of 30.0 m/s.The acceleration due to gravity at the surface of the Moon is 1.62 m/s²,and the Moon has no atmosphere.The height of the rock when it is descending with a speed of 20.0 m/s is closest to

A bicyclist starts a timed race at 6.0 mi/h. In order to win,he must average 21 mi/h. Assuming constant acceleration from the start,how fast must he be traveling at the end of the race?

A test rocket at ground level is fired straight up from rest with a net upward acceleration of 20 m/s².After 4.0 s,the motor turns off but the rocket continues to coast upward with insignificant air resistance.What maximum elevation does the rocket reach?

Assuming equal rates of acceleration in both cases,how much longer would it take a car to stop if braking from 56 mi/h than from 28 mi/h?

A car is traveling north at 17.7m/s. After 12 s its velocity is 14.1 m/s. In the same direction.Find the magnitude and direction of the car's average acceleration.

A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s.The collision takes 20 ms.What is the average acceleration of the ball during the collision with the wall?

A car increases its forward velocity uniformly from 40 m/s to 80 m/s while traveling a distance of 200 m.What is its acceleration during this time?

The slope of a velocity versus time graph gives

A ball is thrown straight up with a speed of 36 m/s.How long does it take to return to its starting point,assuming negligible air resistance?