Single correct option
Which of the following statements about collisions is/are correct?
1. In an isolated system, linear momentum is conserved in every collision.
2. Kinetic energy is conserved in every collision.
1. In an isolated system, linear momentum is conserved in every collision.
2. Kinetic energy is conserved in every collision.
- A. 1 only
- B. 2 only
- C. Both 1 and 2
- D. Neither 1 nor 2
Show answer and solution
Answer: (A) 1 only
Momentum is conserved whenever no external force acts, whatever the type of collision. Kinetic energy is conserved only in perfectly elastic collisions; in inelastic collisions some is lost as heat and sound. So only statement 1 is correct.
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