Question

A crane lifts 300kg weight from earth's surface upto a height of 2m in 3 seconds. The average power generated by it will be

Answer 1

Average power = total energy consumed / total time taken

= mgh/3 seconds
= 300kg×9.8m/s ×2m/ 3 seconds
= 5880/3
= 1960 watt
ratio = 1960:1

I think it is the answer.

hope it helps...

Answer 2

The average power generated is 1960 N/s

Given:

Mass = 300 kg

Height = 2 m

Time = 3 s

Solution:  

The power generated will be calculated by formula given below:

$P=\frac{F \times s}{t}$

Where,

F is the force

s is the displacement  

t is the time

Thereby, we have,

$P=\frac{F \times 2}{3}$

Here, the force is the weight lifted, so,

$P=\frac{m g \times 2}{3}$

$\Rightarrow P=\frac{(300 \times 9.8 \times 2)}{3}$

$P=\frac{5880}{3}$

$P = 1960 \ N/s$