Blocks A (m) and B (2m) are connected by a spring k on a smooth surface. Initially spring is relaxed, A has speed u right and B is at rest. Match.

List 1

1. (A) Velocity of A

2. (B) Velocity of B

3. (C) Kinetic energy of two-block system

4. (D) Spring potential energy

List 2

1. (P) Can never be zero

2. (Q) May be zero at certain instants

3. (R) Is minimum at maximum compression

4. (S) Is maximum at maximum extension