A ballistic pendulum is a device that was used to measure the speeds of bullets before the development of electronic tiring, devices. The device consists of a large block of wood of mass `M`, hanging from two long cords. A bullet of mass `m` is fired into the block. the bullet comes quickly into rest and the block `+` bullet rises to a vertical distance `h` before the pendulum comes momentarily to rest as the ends of the arc. ltbr. In the process. the linear momentum is conserved. In such a collision. some kinetic energy is dissipated as heat: so mechanical energy is not conserved. When there is a loss in mechanical energy, the collision is said to be inelastic. Further when two bodies coalesce, the collision is said to be perfectly inelastic.

The collision of block-bullet system is

Options

A. perfectly elastic
B. partially inelastic
C. partially elastic
D. perfectly inelastic

Answer

D

Explanation

As bullet and block coalesce after collision hence collisio is perfectly inelastic.