Question

A stone of mass 5 kg is tied to a string of length 4 m. If the stone is swirled around by a boy with a linear speed of 20 m/s, what is the centripetal force acting on the stone?

• A. 50 N
• B. 250 N
• C. 25 N
• D. 125 N

Answer 1

The correct option is D

125 N

The centripetal force acting on a body of mass m is given by,

$F_c=\frac{m{v}^2}{r}$

So, $F_c=\frac{5\times {10}^2}{4}=125N$