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A constant retarding force of $50 \mathrm{~N}$ is applied to a body of mass $20 \mathrm{~kg}$ moving initially with a speed of $15 \mathrm{~ms}^{-1}$. How long does the body take to stop?
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Here, $F=-50 \mathrm{~N}, m=20 \mathrm{~kg}, u=15 \mathrm{~ms}^{-1}$ and $v=0$;
Now, $F=m a, a=F / m=-50 / 20=-2.5 \mathrm{~ms}^{-2}$
From relation, $v=u+a t, 0=15-2.6 t, t=15 / 2.5=6 \mathrm{~s}$
Now, $F=m a, a=F / m=-50 / 20=-2.5 \mathrm{~ms}^{-2}$
From relation, $v=u+a t, 0=15-2.6 t, t=15 / 2.5=6 \mathrm{~s}$
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