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The figure below shows a block of ice sliding down a frictionless ramp at an angle...

The figure below shows a block of ice sliding down a frictionless ramp at an angle of 50 degrees while an ice worker pulls on the block (using a rope) with force Fr having a magnitude of 50 N and directed up the ramp. As the block slides down the ramp through a distance,? of 0.50 m, its kinetic energy increases by 80 Joules. What is the mass of the ice block
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Answer #1

work done by applied force

W = 50 * 0.5 * cos 180

W = -25 J

we know

change in kinetic energy = work done by applied force + work done by gravity

80 = - 25 + mgdcos ( 90 - 50)

80 + 25 = m * 9.8 * 0.5 * cos 40

m = 27.973 Kg

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