Question

A man is delivering a cupboard to a house .The cupboards weight is 72kg If the step is 20 cm high how much work will be required to lift the cupboard onto the step . If the men together lift it onto the step in 1.2s,calculate the power developed by each man​

Answer 1

Answer:

given,

$mass(m) = 72 \: kg$

$height \: of \: the \: place(h) = 20 \: cm = 0.2 \: m$

we know,

work done

= mgh

= (72×9.8×0.2) J

= 141.12 J

now,

time required (t)= 1.2 s

we know,

power

$= \frac{w}{t} \\ = \frac{141.12}{1.2} \\ = 117.6$

Answer 2

Answer:

the above solution is correct but at end we have to calculate each men power so it will be divided by two