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A 75 kg man just before contact with the ground has a speed of 6

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A 75 kg man just before contact with the ground has a speed of 6.4 m/s.

(a.) In a stiff-legged landing he comes to a halt in 2.0 ms. What is the average net force that acts on him during this time.

(b.) When he bends his knees, he comes to a halt in 0.10 s. What is the average net force now?

(c.) During the landing, the force of the ground on the man points upward, while the force due to gravity points downward. The average net force acting on the man includes both of these forces. Taking into account the directions of the forces, what is the force of the ground on the man in parts (a) and (b).