Question

A skydiver free falls from rest. How long does it take for the skydiver to reach 7 m/s?

Answer 1

The skydiver needs 0.71 seconds to reach 7 m/s

Step-by-step explanation:

Free Fall Motion

When an object is dropped in free air (no friction) from a certain height h, it follows a free-fall motion, whose acceleration is due exclusively to gravity. The speed at a moment t when the object is dropped (from rest) is:

`V_f=gt`

We need to find How long does the skydiver needs to reach 7 m/s. We solve for t

`\displaystyle t=(V_f)/(g)`

`\displaystyle t=(7)/(9.8)`

`t=0.71\ sec`

The skydiver needs 0.71 seconds to reach 7 m/s