Question

A body of mass $5$ kg is revolving along a circle of a radius $2$ m, with a uniform speed of $4{ms}^{-1}$. The centripetal force acting on a body is ____ N.

• A. $35$ N
• B. zero
• C. $40$ N
• D. $20$ N

Answer 1

The correct option is C $40$ N

Mass, $m=5$ $kg$

Radius, $r=2$ $m$

Linear speed, $v=4$ $m/s$

Centripetal force, $F=\frac{m{v}^2}{r}$

$\Rightarrow F=5\times \frac{16}{2}$

$\Rightarrow F=40$ $N$