physics

A golf ball of mass 125g hits a billards ball of mass 172.5g that is initially at rest. after the colision, the golf ball moves to the right at a speed of 10cm/s. the billards 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?

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1. 125g = 0.125kg,
172.5g = 0.1725 kg.

a. M1*V1 + M2*V2 = M1*V3 + M2*V4.
0.125*V1 + 0.1726*0 = 0.125*0.10 - 0.1725*0.58.

0.125V1 = 0.0125 - 0.10 = -0.0875,
V1 = -0.70 m/s. = 0.70 m/s To the left.

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