A 20.0-kg object starts from rest and slides down an inclined plane.The change in its elevation is 2.50 m and its final speed is 5.00 m/sec.How much energy did the object lose due to friction as it slid down the plane?

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Quizplus · Accepted Answer

The potential energy lost is mgh = 20.0 kg * 9.8 m/s² * 2.50 m = 490 J. The kinetic energy gained is (1/2)mv² = 0.5 * 20.0 kg * (5.00 m/s)² = 250 J. The energy lost to friction is the difference: 490 J - 250 J = 240 J, which rounds to 241 J.

A 200-Kg Object Starts from Rest and Slides Down an Inclined