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3 years ago

PLEASE HELP !!! I NEED TO PASS

Physics

1 answer:

zhannawk [14.2K]3 years ago

7 0

Answer:

Sorry I don't know the answer .Hope other help you.sorryyyyyyyy

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A man takes 20 seconds to climb 5m up a ladder. He weighs 720N. Calculate the power he must deliver to do this.

Inessa05 [86]

Answer:

180 W

Explanation:

The work done by the man against gravity is equal to its gain in gravitational potential energy:

$W=mg\Delta h$

where

(mg) = 720 N is the weight of the man

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Substituting,

$W=(720)(5)=3600 J$

The power he must deliver is given by

$P=\frac{W}{t}$

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Substituting,

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