Question

What is the velocity v of a metallic ball of radius r falling in a tank of liquid at the instant when its acceleration is one half that of a freely falling body ? (The densities of metal and of liquid are r and s respectively and the viscosity coefficient of the liquid is h) –

• A. (r – 2s)
• B. (2r – s)
• C. (r – s)
• D. (r – s)

Answer 1

Answer: (C)

(r – s)

Answer 2

h =

So V =