[填空题]
A softball of mass 0.220 kg that is moving with a speed of 8.5m/gt:a7: ndhan fex( 2ym5p20 u2a/oxyws collides hea*o 0e*up jdo+bd-on and elastically with another ball initially at p oe*u0+ dobj*rest. Afterward the incoming softball bounces backward with a speed of 3.7m/s Calculate
(a) the velocity of the target ball after the collision m/s
(b) the mass of the target ball. kg
(Let A represent the moving softball, and let B represent the ball initially at rest.)
