Question 1

Which of the following statements best describes the concept of 'motion is relative' as discussed in the study materials?

Accepted Answer

Motion is always measured relative to another object or reference point.

Question 2

A car travels 120 km in 2 hours. What is its average speed?

Accepted Answer

$$60\ \mathrm{km/h}$$

Question 3

Which of the following is true about velocity but not about speed?

Accepted Answer

It includes both magnitude and direction.

Question 4

A car moves east at $$100\ \mathrm{km/h}$$ and another car moves west at $$100\ \mathrm{km/h}. $$Which statement is correct?

Accepted Answer

Both cars have the same speed but different velocities.

Question 5

Which of the following scenarios describes an object with constant velocity?

Accepted Answer

A car moving in a straight line at a steady speed.

Question 6

What is the acceleration of a car that increases its velocity from $$13\ \mathrm{m/s} to$$ $$22\ \mathrm{m/s} in$$ $$10\ \mathrm{s}$$?

Accepted Answer

$$0.9\ \mathrm{m/s^2$}$$

Question 7

If a car is moving along a circular path at a constant speed, what can be said about its acceleration?

Accepted Answer

The car has acceleration because its direction is changing.

Question 8

Which of the following best describes the acceleration of an object in free fall near Earth's surface (neglecting air resistance)?

Accepted Answer

It is constant and equal to $$9.8\ \mathrm{m/s^2$}$$ downward.

Question 9

A rock is dropped from rest from a cliff. What is its speed after $$3\ \mathrm{s}$$? (Use $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$30\ \mathrm{m/s}$$

Question 10

How far does a freely falling object fall from rest in $$4\ \mathrm{s}$$? (Use $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$80\ \mathrm{m}$$

Question 11

A ball is thrown straight upward with an initial velocity of $$20\ \mathrm{m/s}. $$What is its velocity when it returns to the same height from which it was thrown? (Neglect air resistance)

Accepted Answer

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

Question 12

An airplane is flying due north at $$80\ \mathrm{km/h}$$ and encounters a $$60\ \mathrm{km/h}$$ crosswind blowing east. What is the plane's speed relative to the ground?

Accepted Answer

$$100\ \mathrm{km/h}$$

Question 13

Which of the following is a correct expression for the distance covered by a freely-falling object starting from rest after time $$t$$?

Accepted Answer

$$d = \frac{1}{2}gt^2$

Question 14

A car decelerates from $$25\ \mathrm{m/s} to $$rest in $$5\ \mathrm{s}. $$What is its acceleration?

Accepted Answer

$$-5\ \mathrm{m/s^2$}$$

Question 15

Which of the following best explains why all objects fall with the same acceleration when air resistance is negligible?

Accepted Answer

The acceleration due to gravity is independent of mass.

Question 16

A runner completes a $$400\ \mathrm{m}$$ lap in $$50\ \mathrm{s}. $$What is the runner's average speed?

Accepted Answer

$$8\ \mathrm{m/s}$$

Question 17

If a ball rolls down an incline and picks up $$2\ \mathrm{m/s} of $$speed each second, what is its acceleration?

Accepted Answer

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

Question 18

A car travels $$150\ \mathrm{km}$$ north and then $$150\ \mathrm{km}$$ south in $$6\ \mathrm{h}. $$What is its average velocity?

Accepted Answer

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

Question 19

Which of the following is a correct equation for acceleration?

Accepted Answer

$$a = \frac{\Delta v}{t}$$

Question 20

A ball is thrown straight upward with an initial velocity $$v_0. $$What is the velocity of the ball at its maximum height?

Accepted Answer

$$0$$

chapter 3 linear motion

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