Question

A small object of uniform density rolls up a curved surface with an initial velocity 'v'. It reaches upto a maximum height of 3v²/4g with  respect to the initial position. The object is

(a) hollow sphere

(b) disc

(c) ring

(d)  solid sphere

Answer 1

Correct option (b) disc

Explanation:

The kinetic energy of the rolling object is converted into potential energy at height

h(= 3v²/4g)

So by the law of conservation of mechanical energy, we have

Hence, the object is disc.