a man delivery a cupboard to a house .the weight of the cupborad is 72 kg .and the height is 20 cm .how much work does it require him to deliver the cupborad to the house
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Answer:
given,
mass(m) = 72 kg
height of the place(h) = 20 cm = 0.2 mheightoftheplace(h)=20cm=0.2m
we know,
work done
= mgh
= (72×9.8×0.2) J
= 141.12 J
now,
time required (t)= 1.2 s
we know,
power
\begin{lgathered}= \frac{w}{t} \\ = \frac{141.12}{1.2} \\ = 117.6\end{lgathered}
=
t
=
1.2
141.12
=117.6
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