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Block B of 40.0 kg is sitting at a frictionless horizontal floor at a height h1...

Block B of 40.0 kg is sitting at a frictionless horizontal floor at a height h1 = 40.0 m above the ground, when a second 100.0 kg block (block A), moving at an unknown speed hits and sticks to block B. After the collision, the combination slides down a hill which has friction, with a speed of 2.00 m/s.

A. What was the speed of the block A before the collision?

B. At the end of the path, a very light horizontal spring of force constant 2000 N/m rests on the floor 20.0 m above the ground. The combination of the blocks will stop once they have compressed the spring by 30.0 cm. What is the work of friction along the way?

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