Question

19.
A weight-lifter lifts 200 kg from the ground to a height of 2 metre in 9 second. The average
power generated by the man is
200X10X2
(A) 15620 W
(B) 3920 W
(C) 1960 W
(D) 980 W​

Answer 1

Explanation:

mass=200kg

h=2 m

g =10m/s2

time=9 s

work done=mgh

=200×10×2

=4000J

power=work done /time

=4000/9=444.44W

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Answer 2

Answer:

p = work done/ time taken

p = 4000/9

therefore p is equal to 444.44 watt.

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