question_answer

With what minimum speed v must a small ball should be pushed inside a smooth vertical tube from a height h so that it may reach the top of the tube? (Radius of the tube is R)

A) \[\sqrt{2g(h+2R)}\]              

B) \[\frac{5}{2}R\]

C) \[\sqrt{g(5R-2h)}\]                      

D) \[\sqrt{2g(2R-h)}\]