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Is Matter Around Us Pure

Question
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Why is it necessary to bend knees while jumping from greater height?

Solution
When jumping from a great height, our feet at once come to rest. For the small time when our legs comes to rest, a large value of force is exerted on our feet. 
When the knees are bent slowly,  the value of time of impact increases and less force acts on feet.  
Therefore, the probability of getting injured is less.