Question

The average force necessary to stop a human with $25$ $Ns$ moment sec is : ($t=0.5sec$)

• A. $624$`
• B. $125$
• C. $50$
• D. $25$

Answer 1

Answer: (C)

$50$

We know Force$F=\frac{\Delta P}{t}$ where $\Delta P$ =change in momentum.

As we need to stop the human its final momentum will be $0$

Thus $\Delta P=25Ns$

and force$F=\frac{25}{0.5}$ here $t=0.5$ seconds

$F=50N$