A 55 kg runner is running forward at 4 m/s when his foot strikes the ground. The vertical ground reaction force acting u

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answerhappygod
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A 55 kg runner is running forward at 4 m/s when his foot strikes the ground. The vertical ground reaction force acting u

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A 55 kg runner is running forward at 4 m/s when his foot strikes the ground. The vertical
ground reaction force acting under his foot at this instant is 2000 N. The friction force acting
under his foot is a 300 N braking force. These are the only external forces acting on the
runner other than gravity. What is the runner's vertical acceleration as a result of these
forces?
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