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Why does a child feel more pain when she...

Why does a child feel more pain when she falls down on a hard cement floor, than when she falls on the soft muddy ground in the garden ?

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When a child falls on a cement floor, her body comes to rest instantly. But = change in moment = constant. As time of stopping decreases, therefore F increases and hence, child feel more pain.
When she falls on a soft muddy ground in the garden, the time of stopping increases and hence, F decreases and she feels lesser pain.
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