JEE Main 2019 Physics question
A simple pendulum, made of a string of length ℓ and a bob of mass m, is released from a small angle . It strikes a block of mass M, kept on a horizontal surface at its lowest point of oscillations, elastically. It bounces back and goes up to an angle . Then M is given by:
Answer: (C)
Solution
Speeds ∝ angles (small angles): .