A boy of mass 40 kg climbs up the stairs and
reaches the roof at a height 8 m in 5 s. Calculate
(i) the force of gravity acting on the boy,
(ii) the work done by him against the force of
gravity,
(iii) the power spent by the boy.
(Take g = 10 m s-2)
Answers
Answered by
17
Answer:i)400N
ii)32J
iii)6.4watt
Explanation:
(i) Force of gravity acting on the boy = mg
= 40 * 10
= 400 N
(ii) Work done by him = mgh
= 40 * 10 * 0.08
= 32 J
(iii) Power = Work / Time
= 32 / 5
= 6.4 Watt
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