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A 115 g granite cube slides down a 45 ∘ frictionless ramp. At the bottom, just...

A 115 g granite cube slides down a 45 ∘ frictionless ramp. At the bottom, just as it exits onto a horizontal table, it collides with a 285 g steel cube at rest. Assume an elastic collision. How high above the table should the granite cube be released to give the steel cube a speed of 200 cm/s ?

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