Question 1

A car travels 150 km in 3 hours. What is its average speed?

Accepted Answer

$$50\ \mathrm{km/h}$$

Question 2

Which of the following best describes velocity?

Accepted Answer

The rate at which position changes, including both magnitude and direction.

Question 3

A runner completes one lap around a 400 m track in 80 seconds, ending where she started. What is her average velocity?

Accepted Answer

$$0\ \mathrm{m/s}$$

Question 4

Which of the following situations involves acceleration?

Accepted Answer

Both B and C.

Question 5

What is the acceleration of a car that increases its velocity from $$20\ \mathrm{m/s} to$$ $$30\ \mathrm{m/s} in$$ $$2\ \mathrm{s}$$?

Accepted Answer

$$2.5\ \mathrm{m/s^2$}$$

Question 6

A ball is dropped from rest. What is its velocity after $$3\ \mathrm{s} of $$free fall (ignore air resistance)?

Accepted Answer

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

Question 7

How far does an object fall from rest in $$4\ \mathrm{s}$$ under gravity (take $$g = 10\ \mathrm{m/s^2$}$$)?

Accepted Answer

$$80\ \mathrm{m}$$

Question 8

Which of the following statements about motion is correct?

Accepted Answer

Motion is always described relative to something else.

Question 9

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

Accepted Answer

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

Question 10

If a car's velocity changes from $$15\ \mathrm{m/s} to$$ $$5\ \mathrm{m/s} in$$ $$2\ \mathrm{s}$$, what is its acceleration?

Accepted Answer

$$-2.5\ \mathrm{m/s^2$}$$

Question 11

Which of the following is NOT a vector quantity?

Accepted Answer

Speed

Question 12

A rock 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

$$2\ \mathrm{s}$$

Question 13

A car moves at a constant velocity. Which of the following must be true?

Accepted Answer

The car's acceleration is zero.

Question 14

A cyclist travels 60 km north in 2 hours, then 60 km south in 2 hours. What is the cyclist's average speed?

Accepted Answer

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

Question 15

Which of the following best describes acceleration?

Accepted Answer

The rate at which velocity changes.

Question 16

A ball is thrown downward with an initial speed of $$5\ \mathrm{m/s}. $$What is its speed after $$2\ \mathrm{s} of $$free fall? (Take $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$25\ \mathrm{m/s}$$

Question 17

You run horizontally at $$4\ \mathrm{m/s} in $$rain that falls vertically at $$4\ \mathrm{m/s}. At $$what angle relative to the vertical do the raindrops appear to fall to you?

Accepted Answer

$$45^{\circ}$$

Question 18

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

Accepted Answer

All objects fall with the same acceleration.

Question 19

A car travels at $$60\ \mathrm{km/h}$$ for $$2$$ hours and then at $$40\ \mathrm{km/h}$$ for $$1$$ hour. What is the average speed for the entire trip?

Accepted Answer

$$53.3\ \mathrm{km/h}$$

Linear Motion: Speed, Velocity, Acceleration, Free Fall, and Vectors

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