I\'ve answered the firs two parts of the question, but cannot answer the last pa

Question

I've answered the firs two parts of the question, but cannot answer the last part asking about resistive force.

A boy of mass 34.4 kg, jumps off a diving platform 1.81 m high. He lands in the water and goes under a distance 1.68 m, before he stops.

In the previous parts, I have found that:
His potential energy on the diving board is 1180 J, and his speed at which he hits the water it 5.96 m/s.

What is the magnitude of the resistive force of the water on the boy? (in Newtons)

Any help is much appreciated -- thank you. :)

Explanation / Answer

energy = F*distance 1/2 * 34.4*5.96^2 + 34.4*9.8*1.68 = F*1.68 F = 700.79 N

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