# Doubt from work, power and energy

**Samarth_2020**#1

**kavish**#3

The question is incorrect.

The value of the distance comes out to be \frac{am}{\sqrt{M^2-m^2}} and not \frac{2amM}{{M^2-m^2}}. Here's the solution. Please do check.

1 Like

**Shreyas_2021**#4

You are incorrect. Acceleration = 0 does not mean that body comes to rest, it simply means that there is no increment in the velocity, which happens to be + ve. So the ring stays in motion.

Sure, at the distance you derived, a=0, but v is not equal to 0. This can be shown by applying the work energy theorem.

1 Like