A ball mass 0.2 kg has a velocity of 1.50 i m/s; a ball of mass 0.3 kg has a velocity of −0.4 i m/s. They meet in a head-on elastic collision. What is the final velocity of the 0.3 kg ball?
a) 1.50 i m/s
b) -0.4 i m/s
c) 0.5 i m/s
d) 1.0 i m/s