Question

A weight lifter lifts a weight off the ground and holds it up then:

• A. Work is done in lifting as well as holding the weight
• B. No work is done in both lifting and holding the weight
• C. Work is done in lifting the weight but no work is required to hold it up
• D. No work is done in lifting the weight but work is required to be done in holding it up

Answer 1

Answer: (C)

Work is done in lifting the weight but no work is required to hold it up

Work is done by the lifter in lifting the weight (displacement of weight upwards in the direction of force).

There is no displacement of weight when he holds it. Hence, no work is done.