A body starts to slide over a horizontal surface with an initial velocity of  $0.5\mathit{ m}/s$. Due to friction its velocity decrease at a rate of $0.105\mathit{ m}/s^2$. How much time will it take for the body to stop?

A body starts to slide over a horizontal surface with an initial velocity of $0.5\mathit{ m}/s$ due to friction its velocity decrease at a rate of $0.105\mathit{ m}/s^2$. The body will take $4.8\mathit{ s}$ to stop.
Given initial velocity,  $u=0.5\mathit{ m}/s$ Acceleration due to friction, $a=-0.105\mathit{ m}/s^2$
Applying equation $v=u+\mathit{at}$
$\Rightarrow \mathit{ }0=0.5-0.105t$ $\Rightarrow \mathit{ t}=\frac{0.5}{0.105}$ $\Rightarrow \mathit{ t}=4.8\mathit{ s}$ approx