Question

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​

Answer 1

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