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

The skydiver needs 0.71 seconds to reach 7 m/s

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:

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

The skydiver needs 0.71 seconds to reach 7 m/s

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i don't understand. explain it clearly