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Which of the following statements is true for collisions-

1. Momentum is conserved in elastic collisions but not in inelastic collisions
2. Total kinetic energy is conserved in elastic collisions but momentum is not conserved
3. Total kinetic energy is not conserved in inelastic collisions but momentum is conserved
4. Total kinetic energy and momentum both are conserved in all types of collisions

Correct answer: Total kinetic energy is not conserved in inelastic collisions but momentum is conserved

Solution

In an isolated collision, total momentum is conserved regardless of whether the collision is elastic or inelastic. In inelastic collisions, some kinetic energy is transformed into heat, sound, or deformation, so total kinetic energy is not conserved.

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