(a) Calculate the impulse experienced when a 55-kg person lands on firm ground after jumping from a height of 2.8 m.
(b) Estimate the average force exerted on the person's feet by the ground if the landing is stiff-legged, and again
(c) With bent legs. With stiff legs, assume the body moves 1.0 cm during impact, and when the legs are bent, about 50 cm.

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