Consider a block of mass 5 Kg that follows a circular motion. Its mass decreases at the rate of 0.5 Kg/s. At what time the centripetal force will be zero on the block?

10 s 41 s 5 s 2 s

10 s

Centripetal force $ \propto $ m As $m \rightarrow 0$ , $\text{Centripetal force } \rightarrow 0$ m = 5 - 0.5t  m = 0 = 5 - 0.5 t $\Rightarrow t = \frac{5}{0.5} = 10 s$