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Blocks A and B are on a frictionless horizontal surface. Block A is to the left...

Blocks A and B are on a frictionless horizontal surface. Block A is to the left of block B. Block A has a mass of 2.5 kg and B has a mass of 1.3 kg. Block A is struck from the left with a hammer. The average force of this impact is 65 N and lasts for 0.12 seconds. Block A slides to the right, strikes and sticks to block B. The two blocks then slide to the right together. They then reach a rough surface which has a coefficient of kinetic friction of 0.31.

What is the speed of the 2 blocks after they stick together (before they reach the rough surface)?

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