Q4 of 19 Page 374

State the SI unit of work and power.

SI unit of work is Joule. It is the scalar quantity. It is defined as the Work done by force of 1 N to move an object by 1 m.

SI unit of Power is Watt denoted by W.


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2

What is power? Write its SI unit.

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To what height should a body of mass 5 kg be raised so that its potential energy is 490 J? [g = 9.8 m/s2]

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Relate watt to joule.

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Find the energy possessed by an object of mass 10 kg when it is at a height of 6m above the ground. [g = 9.8 ms-