Two particles A and B of equal size but of masses m kg and 2 m kg are moving directly towards each other with speeds 21 m/s and 4 m/s respectively. After collision, A moves with a speed of 1 m/s in the original direction. Then:

Options

A. After collision , B moves with a speed of `6 m//s` in a direction opposite to its motion before collision.
B. After collision, B moves with a speed of `6 m//s` in the original direction.
C. The coefficient of restitution is 0.2
D. The impulse of the collision is `20 m` N-S