Question

A small ball starts rolling on a inclined track with becomes loop if radius R in vertical plane.

• A. Speed of the ball at highest point is zero but and highest point is 2R above the ground.
• B. Speed of the ball at highest point is non zero but highest point is 2R above the ground
• C. Speed of the ball is along horizontal at highest point and highest point is less than the 2R above the ground.
• D. Speed of the ball is along horizontal at highest point but height of highest point above the around can not be calculated.

Answer 1

The correct option is C

Speed of the ball is along horizontal at highest point and highest point is less than the 2R above the ground.

In Pure rolling, energy is conserved
$\Delta PE=\Delta T.KE+\Delta R.KE$