6.07 Quiz: Free Fall and Equilibrium

If you drop a penny from a height of 3.0 × 101 m in a vacuum, how long will it take to reach the ground?

2.5 s

If you drop a penny from a height of 3.0 × 101 m in a vacuum, how fast will it be moving when it reaches the ground?

24 m/s

A 90.0 kg skydiver is falling at a constant speed. What is the air resistance force acting on the skydiver?

880 N

Which of these is the best example of free fall?

a baseball thrown directly upward inside a huge tube with air removed from it

When is a real-life object that has been dropped over the side of a tall building closest to being in free fall?

at the start of its fall

A baseball falls over the side of a balloon's gondola. At what point in the baseball's fall has it reached equilibrium?

when its acceleration is zero