A man of mass 40 kg runs upstairsand reaches the roof at 8m in 5s (1)force of gravity on man(2)work done by man against gravity (3) power spent by man
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1. force of gravity of man
F=ma
W=mg
W=40 x 10 (or 9.81 depending which one you're using)
W=400N
2. work done by man against gravity
Work done is a type of energy.
E=mgh
E=40 x 10 x 8
E=3200J
3. power spent on man
P=E/t
P=3200/5
P=640W
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