Question

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. (Assume radius of cross-section of tube is negligible in comparison to R.)

Answer 1

Correct option (d)

Explanation :

For minimum v, velocity of ball at the topmost point will be zero.

By conservation of energy,