Solve the given question :

D e a r S t u d e n t W e m u s t n o t e t h a t t h e o n l y f o r c e a c t i n g o n t h e s p h e r e i s v i s \cos i t y T h u s m a = m \frac{v d v}{d x} = - 6 πηrv = - 6 π \frac{1}{6 π} rv = - rv \int_{v}^{0} m d v = \int_{0}^{x} - r d x \to x = \frac{mv}{r} (C) Regards

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