Question 1

A car travels 5 km east, stops, turns around and travels 5 km west. What is the car’s displacement?

Accepted Answer

$$0\ \mathrm{km}$$

Question 2

Which of the following quantities is a vector?

Accepted Answer

velocity

Question 3

A ball is thrown straight up, reaches a maximum height, then falls to its initial height. While the ball is going up, which statement about the direction of velocity and acceleration is correct?

Accepted Answer

Its velocity points upward and its acceleration points downward.

Question 4

A motorist travels 160 km at $$80.0\ \mathrm{km/h}$$, stops for $$30.0\ \mathrm{min}$$, then travels another 120 km at $$100\ \mathrm{km/h}. $$What is the average speed of the motorist for this trip?

Accepted Answer

$$75.7\ \mathrm{km/h}$$

Question 5

An athlete circles 10 times around a circular 2.0-km track in 110 min. What is the athlete’s average velocity for the ten laps?

Accepted Answer

$$0\ \mathrm{km/h}$$

Question 6

A truck accelerates forward from $$3.0\ \mathrm{m/s} at a $$uniform $$0.4\ \mathrm{m/s^2$}. It $$travels a distance of $$2\ \mathrm{km}$$ while accelerating. How many seconds did it take to travel the $$2\ \mathrm{km}$$?

Accepted Answer

$$99.2\ \mathrm{s}$$

Question 7

A bullet moving horizontally with a speed of $$200\ \mathrm{m/s}$$ strikes a wall and penetrates a distance of $$3.0\ \mathrm{cm}. $$What is the magnitude of the average acceleration of the bullet in the wall?

Accepted Answer

$$6.67\$$times10^5$$\ \mathrm{m/s^2$}$$

Question 8

A ball is fired straight up with a speed of $$25\ \mathrm{m/s}. $$Assuming negligible air resistance, what is the maximum height that the bullet reaches?

Accepted Answer

$$31.9\ \mathrm{m}$$

Question 9

A ball is thrown downward from the top of a building with an initial speed of $$20\ \mathrm{m/s}. It $$strikes the ground after $$2.0\ \mathrm{s}. $$What is the height of the building?

Accepted Answer

$$37.6\ \mathrm{m}$$

Question 10

Suppose a free-fall ride at an amusement park starts at rest and is in free fall. What is the velocity of the ride after $$2.3\ \mathrm{s}$$?

Accepted Answer

$$23\ \mathrm{m/s\ downward}$$

Question 11

A velocity-time table represents the motion of a rightward-moving motorcycle. At $$t=0$$, $$v=26.0\ \mathrm{m/s}$$; at $$t=8.0\ \mathrm{s}$$, $$v=2.0\ \mathrm{m/s}. $$What is the magnitude and direction of the average acceleration?

Accepted Answer

$$-3.0\ \mathrm{m/s^2$}$$, opposite to motion

Question 12

Which equation correctly relates final velocity, initial velocity, acceleration, and displacement for constant acceleration?

Accepted Answer

$$v_f^2$ = v_i^2$ + 2a(x_f - x_i)$$

Question 13

A car is moving with a constant velocity. Which statement concerning its acceleration must be correct?

Accepted Answer

The acceleration is equal to zero.

Question 14

An object is thrown vertically upward with an initial velocity $$v_0. $$What is its velocity at the maximum height?

Accepted Answer

$$0$$

Question 15

A student walks 2.5 km east, then 4.0 km west. What is the total distance and displacement?

Accepted Answer

Distance: $$6.5\ \mathrm{km}$$, Displacement: $$-1.5\ \mathrm{km}$$

Question 16

A ball is thrown straight up with an initial velocity of $$20\ \mathrm{m/s}. $$What is its velocity and acceleration at the top of its trajectory?

Accepted Answer

Velocity: $$0\ \mathrm{m/s}$$, Acceleration: $$-9.8\ \mathrm{m/s^2$}$$

Question 17

A car travels at a constant speed of $$20\ \mathrm{m/s}$$ for $$72\ \mathrm{km}. $$How long does the trip take in hours?

Accepted Answer

$$3.6\ \mathrm{h}$$

Question 18

A student drops a ball from rest from a height of $$45\ \mathrm{m}. $$How long does it take to reach the ground? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$3.03\ \mathrm{s}$$

Question 19

A car accelerates from rest at $$2.0\ \mathrm{m/s^2$}$$ for $$5.0\ \mathrm{s}. $$What is its final velocity?

Accepted Answer

$$10.0\ \mathrm{m/s}$$

Kinematics and Motion: Review and Problem Set (Chapters 1-3)

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드