Question

A golf ball of mass 125 g hits a billiards ball of mass 172.5 g that is initially at rest. After the collision, the golf ball moves to the right at a speed of 10 cm/s. The billiards ball moves to the left with a speed of 58 cm/s. (a) What was the velocity of the golf ball before the collision? (b) What is the change in total kinetic energy of the system at the collision?
m1v1i = miv1f + m2v2f
solve for v1i (watch your directions!)

part b is just the difference of KEi for the one ball and KEf for both balls

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