Question

A highjumper falls on a sandpit but he didnot got any hurt.why?

Answer 1

The sand particles have negligible bonding between them, so when you land on a sand surface the sand particles move downwards and increase the time of deceleration (from the velocity at which you hit the geound to absolute zero). As the time of declaration is increased,you experience a lower impulse.


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Answer 2

When he falls on a a soft landing site[either cushion or sand], then the jumper takes a longer time to come to stop.

⇒The rate of change of momentum of the athlete is less due to which a smaller force will act on athlete.

⇒ So, athlete does not get injury and cushion or sand reduces the momentum of athlete's .

         If the Athlete is made to fall on a hard surface like cement floor, then his momentum is reduced to zero in very less time and thus rate of change of momentum increases due to which large opposing force will act on athlete.

which can lead to serious  injury.

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