Question: A 6.0kg block, starting from rest, slides down a frictionless incline of length 2.0m. when it arrives at the bottom of the incline it's speed

A 6.0kg block, starting from rest, slides down a frictionless incline of length 2.0m. when it arrives at the bottom of the incline it's speed vf. At what distance from the top of the incline is the speed of the block 0.50vf?

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