A person falling on a cemented floor gets injured but a person falling on a heap of sand doesn't get injured. Explain using Newton's Second Law of Motion.
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Answer:there lapse a finite time during the change of momentum on sand as compared to cemented floor where momentum changes more rapidly leading to larger force.
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This is because in heap of sand there is lot of space between the particles which on force reduces while cement is hard and solid which doesn't have much space between its particles. thus in the case of sand the impulse of force is less due to time duration of the activity being higher than in cement case
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