A 15 kg ball moving to the right at 2.0 m/s makes an elastic head-on collision with a 30 kg ball moving to the left at 1.5 m/s. After the collision, the smaller ball moves to the left at 3.0 m/s. Assume that neither ball rotates before or after the collision and that both balls are moving on a frictionless surface. What is the velocity of the 30 kg ball after the collision?

answer; /// i believe that the correct answer is (c)

answer; i believe the correct answer is (40,000 j) good luck

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a and c

c is 100% but i am confused in a