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11. Work and Energy
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Q5 of 19 Page 374

Relate watt to joule.

1 watt is the power of an agent which does the work at the rate of 1 joule per second.

1W = 1 j/s


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3

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]

4

State the SI unit of work and power.

6

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-

7

A boy of mass 80 kg is running at 10 m/s. Find the work done by him.

Questions · 19
11. Work and Energy
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 16 17 18
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