Question

A ball of mass 2.00 kg is tied to a string and swung in a horizontal circle of radius 5 m at a speed of 10 m/s. The magnitude of the centripetal force required for its movement is

Answer 1

The magnitude of the centripetal force

$$F=m\frac{v^2}{R}$$

$$=2.0\:\rm kg\times \frac{(10\: m/s)^2}{5.0\: m}=40\:N$$