[填空题]
Two billiard balls of equal mass undergo a perfe b.3ekra q*ad-9 ox(ngctly elastic.p8u.jg i.c,d + dfqgu head-on collision. If oi fg pc..qud8. udj+,gne ball’s initial speed was 2m/s and the other’s was 3m/s in the opposite direction, what will be their speeds after the collision?(Let A represent the ball moving at 2.00 m/s, and call that direction the positive direction.Let B represent the ball moving at 3.00 m/s in the opposite direction. ) v'$_A$ = m/s v'$_B$ = m/s