Physics - Fluid Question with Solution | TestHub

A small ball is taken inside a deep lake and projected horizontally with velocity of $20\mathrm{m}/\mathrm{s}$. After a long time, it acquires a vertical velocity of $15\mathrm{m}/\mathrm{s}$. If the radius of the ball is 10 mm and the viscosity of water is $0.007\mathrm{Pa}.\mathrm{s}$. What is the initial net force on the ball (in mN). (Take : $\pi =22/7,g=10m/s^2$ )