Chapter 3: One dimensional motion

When an object is in free fall, what happens to its acceleration due to gravity?

• It increases

• It decreases

• It remains constant

• It becomes zero

An astronaut drops a hammer and a feather on the moon (where there is no atmosphere). What happens?

• The hammer falls faster

• The feather floats to the ground

• Neither will fall

• They both hit the ground at the same time

You drop a ball from a 45-meter high building. How long does it take to hit the ground?

• 1.5 seconds

• 3 seconds

• 4.5 seconds

• 6 seconds

If you throw a ball straight up with a speed of 20 m/s, how long will it take to reach its highest point?

• 1 second

• 2 seconds

• 5 seconds

• 10 seconds

If you drop a rock from a cliff and it takes 3 seconds to hit the ground, what is its speed just before it lands?

• 3.3 m/s

• 9.8 m/s

• 19.6 m/s

• 29.4 m/s

A car starts from rest and accelerates at 2 m/s². How far does it travel in 5 seconds

• 5 m

• 10 m

• 25 m

• 50 m

A cyclist moves in a straight line with a = 1 m/s². If their initial speed was 3 m/s, what is their speed after 4 s?

• 7 m/s

• 16 m/s

• 4 m/s

• 24 m/s

A runner increases their speed from 5 to 15 m/s in 5 s while running in a straight line. What is their average speed?

• 10 m/s

• 12 m/s

• 15 m/s

• 20 m/s