# A body of mass 2 kg is moving on the ground comes to rest after some time. The coefficient of kinetic friction between body and the ground is 0.2. The retardation in the body is

$(a)\;9.8\; m/s^2 \quad (b)\;4.73\; m/s^2 \quad (c)\;2.16\; m/s^2 \quad (d)\;1.96 \;m/s^2$

We know that
$a=\mu g$
$\quad=0.2 \times 9.8$
$\quad=1.96 m/s^2$
Hence d is the correct answer.

edited Feb 10, 2014 by meena.p