Two identical balls A and B are moving with velocity $+0.5\; ms^{–1}$ and $– 0.3\; ms^{–1}$ respectively. They collide head on elastically then their velocities after collision will be :

Question

( A ) $-0.3ms^{-1}\& 0.5m^{-1}$
( B ) $0.5 ms^{–1} \& + 0.3 ms^{–1}$
( C ) $0.3 ms^{–1} \& – 0.4 ms^{–1}$
( D ) $–0.4 ms^{–1} \& 0.3 ms^{–1}$