Posted by Bob on Tuesday, December 6, 2011 at 5:09pm.
A 86.0 kg diver falls from rest into a swimming pool from a height of 6.3 m. It takes 1.44 s for the diver to stop after entering the water. Find the magnitude of the average net force exerted on the diver during that time.

Physics  Henry, Thursday, December 8, 2011 at 7:47pm
Vf^2 = Vo^2 + 2g*d,
Vf^2 = 0 + 19.6*6.3 = 123.48,
Vf = 11.1 m/s.
a = (Vf  Vo) / t,
a = (0  11.1) / 1.44 =  7.72 m/s^2.
Fn = ma = 86 * (7.72) = 664 N. in
opposite direction.
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