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A block of wood loses 100 J of gravitati...

A block of wood loses 100 J of gravitational potential energy as it slides down a ramp. If it has 90 J of kinetic energy at the bottom of the ramp, what can you conclude ?

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Frictional forces did 10 J (100 J - 90 J) of work on th block.
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PRADEEP-WORK AND ENERGY-Section - A mock Test
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  2. When a ball is hung from a vertical spring, it stretches the spring. ...

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