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JAMB Physics 2017 Paper
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© africaexams.com
Question : 22
Total: 49
A man of mass 50kg ascends a flight of stains 5m high in 5 seconds. If acceleration due to gravity is 10ms
−
2
the power expended is
100w
200w
400w
500w
Validate
Solution:
Power is the time rate of doing work
i.e power =
energy
time
Since energy = mgH
∴ power =
m
g
H
t
=
50
×
10
×
5
t
= 500W
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