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A 3.0 kg car A travelling 8.5m/s on a frictionless track collides and sticks on to a stationary 2.0 kg car B.

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Welcome Jiwon, we don't answer basic exercises in their raw form like this. There is a post on meta that discusses how you can get help on basic concepts. You are going to want to recall that all collisions conserve momentum to solve these problems. – dmckee♦ Nov 30 '12 at 6:25

closed as too localized by dmckee♦ Nov 30 '12 at 6:23

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