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A body starts to slide over a horizontal surface with an initial velocity of $0.5\ m/s$. Due to friction, its velocity decreases at the rate of $0.05\ m/s^2$. How much time will it takes for the body to stop?
Here, initial velocity $u=0.5\ m/s$
Final velocity $v=0$
Acceleration $a=-0.05\ m/s^2$ [because the velocity is decreasing]
Let the body will take $t\ second$ to stop.
On using the equation of motion, $v=u+at$
$0=0.5-0.05\times t$
Or $0.05t=0.5$
Or $t=\frac{0.5}{0.05}$
Or $t=10\ second$
Therefore, the body will take $10\ seconds$ to stop.
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