A 100 g ball moving to the right at 4.0 m/s collides head-on with a 200 g

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A 100 g ball moving to the right at 4.0 m/s collides head-on with a 200 g ball that is moving to the left at 3.0 m/s.
a. If the collision is perfectly elastic, what are the speed and direction of each ball after the collision?
b. If the collision is perfectly inelastic, what are the speed and direction of the combined balls after the collision?

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