If a cage containing a truck of coal weighing 750 kg is raised to a height of 90m in a minute. What is the total power expended? [g = 10 ms‾²]

A. 11.50 kw
B. 12.60 kw
C. 11.25 kw
D. 12.10 kw

Correct Answer:

Option C – 11.25 kw

Explanation

Power = (work done)/time taken = (mgh)/t
= (750 x 10 x 90)/60 = 11250w = 11.25kw