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A 76 kg jumper lands stiff-legged on the floor and changes his velocity from -8 m/s to zero in 0.3 seconds. Compute the average ground reaction force under his feet during this time interval. If he increased the impact time to 0.4 s, what happens to the ground reaction force? (Caution: net force and ground reaction force is not the same thing! Be careful here!).

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