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Earn 100

When a ball is thrown up, its kinetic energy decreases and then increases. Does this violate the law of conservation of momentum?
Important Questions on Work, Power and Energy
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The values of the coefficient of friction and the distance , are respectively close to:


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[ is the acceleration due to gravity]

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In the diagram below the spring has a force constant of , the block has a mass of , and the height of hill is . Determine the compression of the spring such that the block just reaches to the top of the hill.
(Assume that there are no non-conservative forces involved.)

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Name a machine that converts electrical energy into mechanical energy.

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