a child's ball, mass of 250g, rolls due east along the ground at 4.2m/s towards a stationary bowling ball, of mass 3.2kg. after the collision, the bowling ball travels in a direction 32degrees southeast at 38.7cm/s.
a) what is the speed of the child's ball after the collision?
b) what is the direction in which the child's ball travels?
c) what fraction of the original kinetic energy is transformed into heat?