give reason:- An athlete jumps on sand not on concrete floor during a long jump.
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When a high jumper falls on a soft landing site(such as cushion or a heap of sand), then the jumper takes a longer time to come to stop. ... If however, a high jumping athlete falls from a height on to hard ground, then his momentum will be reduced to zero in a very short time.
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When a high jumper falls on a soft landing site(such as cushion or a heap of sand), then the jumper takes a longer time to come to stop. ... Thus, the cushion or sand, being soft, reduces the athlete's momentum more gently.
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