A block of mass $1\,kg$ lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is $0.6$ . If the acceleration of the truck is $5\,m\,s^{-2}$ . The frictional force acting on the block is ........ $N$
As $\mathrm{F}<\mathrm{f},$ so force of friction $=5 \mathrm{N}$
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