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

Explanation:

Given:

h = 5m

mg =720N

To calculate the workdone using the formula

W = mgh

Where W is the workdone

"m" is the mass of the man

"h" is the distance covered

Weight of the man = mg = 720N

where "g" is the Acceleration due to gravity

"m" is the mass of the man

Substitute the value of "h" and "mg"

W = 720 × 5 = 3600J

To calculate the power

Where W= 3600W

t = time taken = 20s

P = 3600/20

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