Explain why a rumer presses the ground with his feet before he starts his run
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The runner presses his feet in the ground to reduce the frictional force by which he could easily fall
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Answer:Using the Newtons's third law of motion - "For every action there in an equal and opposite reaction". The runner presses the ground with his feet before he starts his run in turn the ground deploy a reaction force on the runner in the forward direction to help him run.
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