Answers

2015-12-31T13:38:13+05:30
M=50 kg
t=30sec
h=20/100 X 30=6
P=W/t
work done=mgh
therefore,P=mgh/t  (g=10m/s^2)
                 =(50*10*6)/30
                 =100
hence P=100
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2015-12-31T14:32:00+05:30
mass = 50kg
time taken = 30 sec
steps =30
each height =20cm =0.2m
so, the total height = 6m
now, power =work / time ...(1)
work = force * distance ...(2)
and force = weight = mg = 50kg * 10m/s² = 500 N ...(3)
now, putting the value of (2) and (3) in (1)
power = 500 * 6 / 30
power = 3000 / 30
∴power = 100 W

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