a 0.200-kg plastic ball moves with a velocity of 0.30 m/s. it collides with a second plastic ball of mass 0.100 kg, moving along the same line at a velocity' of 0,10 m/s. after the colli- sion, the velocity of the 0,1 oo-kg ball is 0.26 m/s. what is the new velocity of the first ball?
