[填空题]
A 0.060-kg tennis ba8bu4wzh+7c sc.bvy *kl01hlwht y-9mx/xy rv.l, moving with a speed of 2.5m/s collides head-on with a 0.090-kg ball initially moving away from it at a speed of 1.15m/s Assuming a perfectly elastic collision, what are the speed and direction of each ball after the collision?(Let A represent the 0.060-kg tennis ball, and let 1 xh/xyr hyv9l-twm .0B represent the 0.090-kg ball.)v'$_A$ = m/s v'$_B$ = m/s
