Consider the following statement. When jumping from some height, you should bend your knees as you come to rest instead of keeping your legs stiff. Which of the following relations can be useful in explaining the statement?

Options

A. `Delta vec(P_(1)) = - Delta vec(P_(2))`
B. `Delta E = - Delta (PE + KE) = 0`
C. `vec(F) Delta t = m Delta vec(v)`
D. `Delta vec(x) prop Delta vec(F)`

Answer

C

Explanation

`vec(F) Delta t = m Delta vec(v) rArr F = (m Delta vec(v))/(Delta t) rArr F prop (1)/(Delta t)`
by doing so time of change in momentum increases and impulsive force on knees decreases.