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Choose the correct option: A weightlifter lifts a weight off a ground and holds it up: (a)work is done in lifting as well as holding the weight (b)no work is done in lifting the weight and holding it (c)work is done in liftting the weight but no work is done in holding it up (d)no work is done in lifting the weight but work is done in holding it up.

Choose the correct option:
A weightlifter lifts a weight off a ground and holds it up:
(a)work is done in lifting as well as holding the weight
(b)no work is done in lifting the weight and holding it
(c)work is done in liftting the weight but no work is done in holding it up
(d)no work is done in lifting the weight but work is done in holding it up.
 

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1 Answers

Arun
25750 Points
6 years ago
Dear Rahul
 
When a weightlifterifts a weight,
Work done by lifting the force F
W(1) = Fs cos0° = Fs
But work done in lifting the weight is 0(zero). Because displacement is zero.
Hence option C is correct.
 
Regards
Arun (askIITians forum expert)

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