Q47 / 105 · NTA Abhyas (JEE Main) 2020 · Physics · Center of Mass Momentum and Collision
A ball of mass moving with velocity strikes the bob of a pendulum at rest. The mass of the bob is also . If the collision is perfectly inelastic, the height to which the bob will rise is given by then
Correct answer: 8
Solution
Because the collision is perfectly inelastic, hence the two blocks stick together. By conservation of linear momentum,
or
By conservation of energy,
or
or
By conservation of energy,
or
Hence, the correct answer is 8.