If a body weighing 4 kg is lifted up-to the hight of 1oo metres what will be the work done? (work, power, energy) chapter
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Answer:
Work required is 4000 J.
Explanation:
We need to do work against gravity to lift the object.
We know that work = Force . Displacement.
Weight of the body is mg = 4(40) = 160 N.
Displacement of the body is 100 m.
Now the is moved up and force is acting down, so angle between them is 180°.
∴ w = 40 x 100 x cos 180
w = -4000 J (Here negative sign implies force and displacement are in opposite direction).
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