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JEE MAIN 2021
22-07-21 S2
Question
A porter lifts a heavy suitcase of mass 80 kg and at the destination lowers it down by a distance of 80 cm with a constant velocity. Calculate the workdone by the porter in lowering the suitcase.
$\left(\right.$ take $\left.\mathrm{g}=9.8 \mathrm{~ms}^{-2}\right)$
Select the correct option:
A
-62720.0 j
B
-627.2 j
C
+627 .2 j
D
784. 0 j
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
W₍water₎ + W₍mg₎ = ΔK.E. = 0, W₍water₎ = −W₍mg₎ = −mgh, 80 × 9.8 × 8 = −627.2 J
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