Question

Identify the correct statements from the following:
a) A bullet is fired into a wooden block is an "inelastic collision"
b) A running man jumps into a train is an "inelastic collision"
c) If the coefficient of restitution is zero the collision is perfectly "inelastic"
d) There is no loss of kinetic energy during inelastic collision.

• A. a & b are true
• B. a, b & c are true
• C. only a is true
• D. a, b, c & d are true

Answer 1

The correct option is B a, b & c are true

1) K.E lost as heat, when bullet is fired into a block.

2) K.E lost as frictional heat, when a running man jumps into a train.Hence is an inelastic collision.

3) Coefficient of restitution is zero for perfectly inelastic collision.The objects do not move apart after the collision, but instead they coalesce. Kinetic energy is converted to heat or work done in deforming the objects.

4) There is no loss of kinetic energy during perfectly elastic collision but K.E gets lost during inelastic collision as the velocity of the moving object becomes zero in that case.