Question

A block of mass 2 kg is given a push horizontally and then the block stars sliding over a horizontal plane. The graphs shows the velocity - time graph of the motion. The coefficient of sliding friction between the plane and the block is

• A. 0.02
• B. 0.2
• C. 0.04
• D. 0.4

Answer 1

Answer: (B)

0.2

Acceleration of the body is the slope of the v-t graph.
From the graph, slope of line $=\frac{4-8}{4}=-2$.
So deceleration is $2m/s^2$
$\mu g=|a|=2$
$⟹\mu =2/10=0.20$