Question

A student of mass m is at a swimming pool. She climbs the steps to the diving board 4.0 m above the water. She jumps off the board, which enables her to rise a further 0.7 m before she begins her descent into the pool. At what speed does she enter the water?

You may assume that the acceleration due to gravity, g, is 9.8 m s−2.

Your answer for this question should be presented under these three headings:

Decide how you are going to
tackle the problem.
Do the calculation.
Check that your answer makes sense.

Answer 1

mg(H+h)=mv²/2
v = sqrt{2g(H+h)}

Answer 2

stop cheating and do your test