Question

A disc of mass `m` is connected with an ideal spring of stiffness `k`. If it is released from rest, it rolls without sliding on an inclination plane. The maximum elongation of the spring is:

A. `(mg sin theta)/k`
B. `(2mg sin theta)/(3k)`
C. `(3mg sin theta)/k`
D. `(2 mg sin theta)/k`

Answer 1

Correct Answer - D
We use work enregy principale
`mgsin thetaxxx-1/2kx^(2)=0 rArrx=(2mg sin theta)/k`