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Conservation of energy: Numerical calculations

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A 4.0kg box is released from rest on a frictionless ramp. The box slides from the ramp onto a rough horizontal surface with a friction coefficient μk=0.50. The box slides 2.0m horizontally until it stops.
What height was the box on the ramp?
Round answer to two significant digits.
  • Your answer should be
  • an exact decimal, like 0.75