Question

A simple pendulum is released from a as shown. If m and l represents the mass of the bob and length of the pendulum respectively, the gain in kinetic energy at b is

Answer 1

at point A, potential energy = mgl

at point B, potential energy = mg(l - lcos30°)

we know for simple pendulum, gain in kinetic energy = -loss in potential energy

= -(potential energy at B - potential energy at A)

= -[mg(l - lcos30°) - mgl ]

= mglcos30°

= √3mgl/2

hence, gain in kinetic energy at B = √3mgl/2

Answer 2

Answer:

This is the answer and full complete method of this sum. Hope this will help you . Physics is a great subject . All the best.