A $0.5 k g$ ball moves in a circle of radius $0.4 m$ at a speed of $4 m s^{- 1}$ . The centripetal force on the ball is

10 N

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20 N

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40 N

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80 N

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Solution

The correct option is B $20 N$
Given : $m = 0.5 k g$ $R = 0.4 m$ $v = 4 m / s$
Centripetal force $F = \frac{m v^{2}}{R} = \frac{0.5 \times 4^{2}}{0.4} = 20$ $N$

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