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Problem

The kinetic energy of a rolling billiard ball is given by
KE = 12 mv2. Suppose a 0.17-kg billiard ball is rolling down a
pool table with an initial speed of 4.5 m/s. As it travels, it loses
some of its energy as heat. The ball slows down to 3.8 m/s and
then collides head-on with a second billiard ball of equal mass.
The first billiard ball completely stops and the second one rolls
away with a velocity of 3.8 m>s. Assume the first billiard ball is
the system. Calculate q.