Question

A body initially at rest and sliding along a frictionless track from a height ft (as shown in the figure)

just completes a vertical circle of diameter AB = D. The height h is equal to

(a) 3/2 D

(b) D

(c) 7/5 D

(d) 5/4 D

Answer 1

Correct option (d) 5/4 D

Explanation:

As body is at rest initially, i.e., speed = 0.

At point A, speed = v.

As track is frictionless, so total will remain constant