Question 1

A car travels 5 km east, then turns around and travels 2 km west along a straight road. What is the car's displacement and total distance traveled?

Accepted Answer

Displacement: $$3\ \mathrm{km}$$ east; Distance: $$7\ \mathrm{km}$$

Question 2

Which of the following statements about average velocity and average speed is correct?

Accepted Answer

Average velocity can be zero even if average speed is not zero.

Question 3

A runner completes one lap around a 400 m track in 50 s, ending at the starting point. What is the runner's average velocity and average speed?

Accepted Answer

Average velocity: $$0\ \mathrm{m/s}$$; Average speed: $$8\ \mathrm{m/s}$$

Question 4

A cyclist slows down from $$12\ \mathrm{m/s} to$$ $$4\ \mathrm{m/s} in$$ $$2.0\ \mathrm{s}. $$What is the average acceleration?

Accepted Answer

$$-4.0\ \mathrm{m/s^2$}$$

Question 5

A ball is thrown straight up with an initial velocity of $$20\ \mathrm{m/s}. $$Neglecting air resistance, what is the velocity of the ball when it returns to its starting point?

Accepted Answer

$$-20\ \mathrm{m/s}$$

Question 6

A jet accelerates from rest at a constant rate down a runway. If it reaches a speed of $$72\ \mathrm{m/s}$$ after traveling $$1.2\ \mathrm{km}$$, what is its acceleration?

Accepted Answer

$$2.16\ \mathrm{m/s^2$}$$

Question 7

Which of the following graphs best represents the position vs. time graph for an object moving with constant negative velocity?

Accepted Answer

A straight line with negative slope

Question 8

A car moves in the $$+x$$ direction and then reverses to move in the $$-x$$ direction. During this trip, which is true about the magnitude of its average velocity compared to its average speed?

Accepted Answer

The magnitude of average velocity is less than the average speed.

Question 9

A swimmer swims $$50\ \mathrm{m}$$ across a pool in $$20\ \mathrm{s}$$, then swims back in $$30\ \mathrm{s}. $$What is the swimmer's average speed for the entire trip?

Accepted Answer

$$1.0\ \mathrm{m/s}$$

Question 10

A ball is dropped from rest from a height of $$20\ \mathrm{m}. $$How long does it take to reach the ground? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.02\ \mathrm{s}$$

Question 11

A car is moving at $$30\ \mathrm{m/s}$$ and comes to a stop in $$5.0\ \mathrm{s}$$ with constant acceleration. What is the distance it travels before stopping?

Accepted Answer

$$75\ \mathrm{m}$$

Question 12

Which of the following is true for an object in free fall near Earth's surface (neglecting air resistance)?

Accepted Answer

The acceleration is constant and directed downward.

Question 13

A springbok jumps straight up with an initial velocity of $$6.00\ \mathrm{m/s}. $$What is the maximum height it reaches? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$1.84\ \mathrm{m}$$

Question 14

Which kinematic equation would you use to find the final velocity of an object given its initial velocity, acceleration, and displacement, but not time?

Accepted Answer

$$v^2$$ = $$v_0^2 + 2a(x$$ - $$x_0$$)$$

Question 15

A car travels $$6.0\ \mathrm{km} at$$ $$50\ \mathrm{km/h}$$ and then another $$6.0\ \mathrm{km} at$$ $$70\ \mathrm{km/h}. $$What is the average speed for the entire trip?

Accepted Answer

$$58.3\ \mathrm{km/h}$$

Question 16

A velocity vs. time graph for an object is a straight line with a positive slope. What does this indicate about the object's motion?

Accepted Answer

The object is accelerating at a constant rate.

Question 17

A monkey drops from a tree limb $$1.80\ \mathrm{m}$$ above the ground. How fast is the monkey moving just before it reaches the ground? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$5.94\ \mathrm{m/s}$$

Question 18

Two cars are $$100\ \mathrm{m}$$ apart and move toward each other. Car A moves at $$30.0\ \mathrm{m/s}$$, and Car B starts from rest and accelerates at $$4.00\ \mathrm{m/s^2$}. $$How long until they collide?

Accepted Answer

$$3.33\ \mathrm{s}$$

CH. 2

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드