Question

A block of mass 2 kg is given a push for a moment horizontally and then the block starts sliding over a horizontal plane. The graph shows the velocity-time graph of the motion. The co-efficient of sliding friction between the plane and the block is $\mu$, then the value of $10\mu$ is (Answer upto two digit after decimal places)

Answer 1

The magnitude of deceleration from graph is $a=\frac{8-0}{4-0}=2m/s^2$
The deceleration of block is
$a=\mu g$ $\therefore$ $\mu =\frac{a}{g}=0.2$
So value of $10\mu =2$