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Exam 2: Kinematics: Motion in One Dimension

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Question 61

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If you run a complete loop around an outdoor track of length 400 m in 100 s,find your (a)average velocity and (b)average speed.

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Question 62

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Suppose that a car traveling to the west begins to slow down as it approaches a traffic light.Which of the following statements about its acceleration is correct?

A) The acceleration is toward the east.
B) Since the car is slowing down, its acceleration must be negative.
C) The acceleration is zero.
D) The acceleration is toward the west.

E) B) and D)
F) B) and C)

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Question 63

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Arthur and Betty start walking toward each other when they are 100 m apart.Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s.How long does it take for them to meet?

A water rocket can reach a speed of 75 m/s in 0.050 seconds from launch.What is its average acceleration?

If,in the figure,you start from the Bakery,travel to the Cafe,and then to the Art Gallery (a)what distance you have traveled? (b)what is your displacement?

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

A rock is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration of objects in free fall is 1.5 m/s² and there is no atmosphere.How long does it take for the laser to reach the maximum height?

An airplane needs to reach a forward velocity of $203.0 \mathrm {~km} / \mathrm { h }$ to take off.On a $2000 - m$ runway,what is the minimum uniform acceleration necessary for the plane to take flight if it starts from rest?

The motion of a particle is described in the velocity vs.time graph shown in the figure. Over the nine-second interval shown,we can say that the speed of the particle

A ball is thrown upward at a velocity of 19.6 m/s.What is its velocity after 3.0 s,assuming no air?

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 velocity?

A car is moving with a speed of 32.0 m/s.The driver sees an accident ahead and slams on the brakes,causing the car to slow down with a uniform acceleration of magnitude 3.50 m/s².How far does the car travel after the driver put on the brakes until it comes to a stop?

An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles.What is the average speed for the trip?

A car starting from rest accelerates at a constant 2.0 m/s² for 10 s.It then travels with constant speed it has achieved for another 10 s.Then it finally slows to a stop with constant acceleration of magnitude 2.0 m/s².How far does it travel after starting?

Starting from rest,a dragster travels a straight 1/4 mi racetrack in 6.70 s with constant acceleration.What is its velocity when it crosses the finish line?

A car travels at 15 m/s for 10 s.It then speeds up with a constant acceleration of 2.0 m/s² for 15 s.At the end of this time,what is its velocity?

A train starts from rest and accelerates uniformly until it has traveled 5.6 km and acquired a forward velocity of $42 \mathrm {~m} / \mathrm { s }$ The train then moves at a constant velocity of $42 \mathrm {~m} / \mathrm { s }$ for 420 s.The train then slows down uniformly at $0.065 \mathrm {~m} / \mathrm { s } ^ { 2 }$ until it is brought to a halt.The acceleration during the first 5.6 km of travel is closest to which of the following?

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

Acceleration is sometimes expressed in multiples of g,where $g = 9.8 \mathrm {~m} / \mathrm { s } ^ { 2 }$ is the acceleration of an object when it is in the state of free fall.In a car crash,the car's forward velocity may go from $29 \mathrm {~m} / \mathrm { s }$ to $0 \mathrm {~m} / \mathrm { s }$ in $0.15 \mathrm {~s}$ How many g's are experienced,on average,by the driver?

A car accelerates from $5.0 \mathrm {~m} / \mathrm { s }$ to $21 \mathrm {~m} / \mathrm { s }$ at a constant rate of $3.0 \mathrm {~m} / \mathrm { s } ^ { 2 }$ How far does it travel while accelerating?