Question

A strong man of mass 80 kg had a sack of 10 kg strapped to his back. He climbed vertically up, on a straight coconut tree at a uniform pace of 1 stride in 2 seconds. He took total 40 strides, each 20 cm high. Find the power generated by his legs.​

Answer 1

Answer:

Solution

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Correct option is A)

Potential energy=mass×acceleration due to gravity x−height

P.E.=m×g×h

According to the given condition -

m=80+20=100kg

g=9.8m/s

2

h=25×40=1000cm=1m

P.E=Work Done=100×9.8×1=980J

Power is rate of work done =

Time Taken

Work Done

=

20

980

=49J/s=49Watt

Answer 2

Explanation:

Potential energy=mass×acceleration due to gravity x−height

P.E.=m×g×h

According to the given condition -

m=80+20=100kg

g=9.8m/s

2

h=25×40=1000cm=1m

P.E=Work Done=100×9.8×1=980J

Power is rate of work done =

Time Taken

Work Done

=

20

980

=49J/s=49Watt

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