Question

A weight-lifter lifts a weight of $2000N$ straight up to a height of $2.25m$ in $65$ seconds. The weight-lifter kept holding the weight at the same height for the next $4$ seconds before dropping it to the floor. Find out how much work did the weight lifter do while holding the weights overhead for $4$ seconds ?

• A. $1300Joules$
• B. $3077Joules$
• C. $4500Joules$
• D. $8000Joules$
• E. No work was done

Answer 1

Answer: (E)

No work was done

We know that work done is given by ,

$W=F\times s$ where $F$ is force $s$ is displacement in direction of force

while the lifter is holding the weights overhead for $4s$ , there is no displacement , so work done $W=F\times 0=0$