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What is the shape of the graph between speed and kinetic energy of a body?

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Important Questions on Work, Energy and Power

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Two bodies having kinetic energy in the ratio 4: 1, are moving with same linear velocity. The ratio of their masses is
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A quarter horse power motor runs at a speed of 600 rpm. Assuming 60% efficiency, the work done by the motor in one rotation is
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An engine develops 20 kW of power. How much time will it take to lift a mass of 200 kg to a height of 40 m? g=10 m s-2
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Water is falling on the blades of a turbine from a height of 25 m.3×103 kg of water pours on the blade per minute. If the whole of energy is transferred to the turbine, power delivered is:
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A body of mass 8 kg, under the action of a force, is displaced according to the equation s=t24 m, where 't' is the time. Find the work done by the force in the first 4 seconds.