Qstnid -I-11-if You Jump Barefoot On A Hard Surface, Your Legs Are Injured. But They Are Not Injured If You Jump On A Soft Surface Like Sand Or Pillow. Why? - 05: Newton's Laws Of Motion

with Solutions -

#11
If you jump barefoot on a hard surface, your legs are injured. But they are not injured if you jump on a soft surface like sand or pillow. Why?
Ans : In both the cases, change in momentum is same but the time interval during which momentum changes to zero is less in the first case. So, by `` F=\frac{dP}{dt}`` , force in the first case will be more. That's why we are injured when we jump barefoot on a hard surface.