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a 300 g car is at a top of a hill that is 5 m tall,...

a 300 g car is at a top of a hill that is 5 m tall, and rolls down colliding with a car that is 400 g that was at the bottom of that hill what is the height that the carts should reach? And what is the minimum initial speed that the car needs to go to be at the top of the right hill (if the hill on the right was 1 m)

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