Question

A truck carries a $2$ ton stone-block on a level horizontal road. The coefficient of static and kinetic frictions between the stone-block and truck-bed are $0.4$ and $0.2$, respectively. When the truck accelerates at $2m/s^2$, how much friction (in $N$ ) acts between the stone-block and the truck-bed? $\left(g=10m/s^2\right)$

Answer 1

Answer: 4000

Maximum acceleration upto which no relative motion occur $=\mu g=4m/s^2$
So, no relative motion at $a=2m/s^2$