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An object of mass 40 kg is raised to a h...

An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy ? If the object is allowed to fall, find its kinetic energy when it is half-way down. Take` g = 10 ms ^-2`.

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MODERN PUBLICATION-WORK AND ENERGY-EXERCISE
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  2. Does work has direction associated with it?

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  3. For what value theta is work done maximum

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  4. For what value theta is work done zero?

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  9. Define work. Write its formula. What is the SI unit of work? Is it a s...

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  10. Give three situations in which a force produces displacement but still...

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  12. A horizontal force of 20 N is required to keep a body moving in a hori...

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  16. The ratio S.I unit to C.G.S. unit of work is .

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  17. Can every force do work?

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  18. When work is done on a body then kinetic energy of the body. (increase...

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  19. A book falls freely from the table top. Is work done by some force dur...

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  20. A boy sitting in a moving car possesses kinetic energy.

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  21. If momentum of a body is doubled, the kinetic energy becomes times.

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