Question a toy car of mass 2kg is moving to the right with, Ask an Expert

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Question: A toy car of mass 2kg is moving to the right with speed 4m/s. Another toy car of mass 6kg is moving to the left with speed 5 m/s. They collide and stick together.

Part A: How much kinetic energy is lost in the collision?

I don't know how to get that answer for the above question. Please help! Thanks.

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