[填空题]
A 0.060-kg tennis ball, movuyg b h;qcvfam4-:4+finb+dzvf.7 z- 2sw v+ 4q.wruzuhg 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 B represent the 0.090-kg ball.)v'wzzub q.+fu v+r7v-wh.z ds42$_A$ = m/s v'$_B$ = m/s
