Question

Two girls, A and B each of weight 400 N climb up a rope through a height of 8 m. Girl A takes 20 s while Girl B takes 50 s to accomplish this task. What is the power expended by each girl?

Answer 1

Power by A= 400*8/20=20*8= 160 Watt
Power by B= 400*8/50=8*8=64 Watt

Answer 2

✯✯ QUESTION ✯✯

Two girls, A and B each of weight 400 N climb up a rope through a height of 8 m. Girl A takes 20 s while Girl B takes 50 s to accomplish this task. What is the power expended by each girl?

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✰✰ ANSWER ✰✰

➮For Girl A : -

$\longmapsto\tt{Weight=400N}$

$\longmapsto\tt{Height=8m}$

$\longmapsto\tt{Time=20sec}$

➥Using Formula : -

$\longmapsto\tt{\small{\boxed{\bold{\bold{\purple{\sf{Power=\dfrac{F\times{s}}{t}}}}}}}}$

➥Putting Values : -

$\longmapsto\tt{\dfrac{400\times{8}}{20}}$

$\longmapsto\tt{40\times{4}}$

$\longmapsto\tt\bold{160\:Watt}$

_______________________

➮For Girl B : -

$\longmapsto\tt{Weight=400N}$

$\longmapsto\tt{Height=8m}$

$\longmapsto\tt{Time=5sec}$

➥Using Formula : -

$\longmapsto\tt{\small{\boxed{\bold{\bold{\green{\sf{Power=\dfrac{F\times{s}}{t}}}}}}}}$

➥Putting Values : -

$\longmapsto\tt{\dfrac{400\times{8}}{50}}$

$\longmapsto\tt{8\times{8}}$

$\longmapsto\tt\bold{64\:Watt}$

• Power expended by Girl A is 160W..
• Power expended by Girl B is 64W..