Question 1

A car travels 150 km north in 3 hours, then 150 km south in 2 hours. What is the car's average speed for the entire trip?

Accepted Answer

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

Question 2

Which of the following statements best describes the difference between speed and velocity?

Accepted Answer

Velocity includes both magnitude and direction, speed only has magnitude.

Question 3

A runner completes a 400 m lap in 50 s. What is her average speed?

Accepted Answer

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

Question 4

A car's speed increases from $$20\ \mathrm{m/s} to$$ $$30\ \mathrm{m/s} in$$ $$5\ \mathrm{s}. $$What is its average acceleration?

Accepted Answer

$$\displaystyle 1\ \mathrm{m/s^2$}$$

Question 5

Which of the following scenarios describes an object that is accelerating?

Accepted Answer

A car slowing down as it approaches a stop sign.

Question 6

A ball is dropped from rest. What is its velocity after $$3\ \mathrm{s}$$, assuming $$g = 10\ \mathrm{m/s^2$}$$ and no air resistance?

Accepted Answer

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

Question 7

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

Accepted Answer

$$\displaystyle 80\ \mathrm{m}$$

Question 8

A plane flies east at $$80\ \mathrm{km/h}$$ while a crosswind blows north at $$60\ \mathrm{km/h}. $$What is the plane's resultant speed?

Accepted Answer

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

Question 9

You run horizontally at $$4\ \mathrm{m/s} in $$rain that falls vertically at $$4\ \mathrm{m/s}. $$What is the magnitude of the velocity of the raindrops relative to you?

Accepted Answer

$$\displaystyle 5.7\ \mathrm{m/s}$$

Question 10

Which of the following is NOT a vector quantity?

Accepted Answer

Speed

Question 11

A car travels at a constant speed of $$30\ \mathrm{m/s}$$ around a circular track. Which statement is true?

Accepted Answer

The car is accelerating because its direction is changing.

Question 12

A car's velocity changes from $$15\ \mathrm{m/s}$$ east to $$15\ \mathrm{m/s}$$ west in $$5\ \mathrm{s}. $$What is the magnitude of its average acceleration?

Accepted Answer

$$\displaystyle 3\ \mathrm{m/s^2$}$$

Question 13

Which of the following best describes 'motion is relative'?

Accepted Answer

Motion is always measured relative to a chosen reference point.

Question 14

A car accelerates uniformly from rest to $$20\ \mathrm{m/s} in$$ $$4\ \mathrm{s}. $$What is the distance covered?

Accepted Answer

$$\displaystyle 40\ \mathrm{m}$$

Question 15

Which of the following is an example of instantaneous speed?

Accepted Answer

The speed shown on a car's speedometer at a specific moment.

Question 16

A ball is thrown straight up with an initial velocity of $$20\ \mathrm{m/s}. $$How long does it take to reach its highest point? (Assume $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$\displaystyle 2\ \mathrm{s}$$

Question 17

A car travels $$60\ \mathrm{km} in$$ $$2\ \mathrm{h}. $$What is its average speed?

Accepted Answer

$$\displaystyle 30\ \mathrm{km/h}$$

Question 18

Which of the following describes a situation where an object has zero acceleration?

Accepted Answer

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

Question 19

A rock is dropped from a cliff and falls for $$5\ \mathrm{s}. $$What is its velocity just before hitting the ground? (Assume $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$\displaystyle 50\ \mathrm{m/s}$$

Linear Motion: Speed, Velocity, and Acceleration

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