[填空题]
A 0.450-kg ice puck, mov8nph.i9 (-s4yc.omtquht d o8nql36p 4 hfr0wul n+t 30kh1kxing east with a speed of 3m/s has a head-on collision with a 0.900-kg puck initially at rest. Assuming urnw03t40 xlh 1kkh +fa perfectly elastic collision, what will be the speed and direction of each object after the collision?Let A represent the 0.450-kg puck, and let B represent the 0.900-kg puck. v'$_A$ = m/s v'$_B$ = m/s