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  4. A constant retarding force of 80 N is applied to a body of mass 50 kg which is moving initially with a speed of 20 m/s . What would be the time required by the body to come to rest?

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Q. A constant retarding force of $ 80\,N $ is applied to a body of mass $ 50\,kg $ which is moving initially with a speed of $ 20\,m/s $ . What would be the time required by the body to come to rest?

J & K CETJ & K CET 2014Laws of Motion

Solution:

Here, $ a=\frac{F}{m}=\frac{80}{50}=1.6\,m/{{s}^{2}} $
$ u=20\,m/s $ and $ v=0 $
From $ v=u+at $
$ 0=20-1.6\times t $
$ t=\frac{20}{16}=12.5\,s $