If a cage containing a truck of coal weighing 750 kg is raised to a height of 90 m in a minute, what is the total power expended?
[g = 10 ms2]
[g = 10 ms2]
-
A.
11.50 kw -
B.
12.60 kw -
C.
11.25 kw -
D.
12.10 kw
Correct Answer: Option C
Explanation
Power = (work done)/time taken = (mgh)/t
= (750 x 10 x 90)/60 = 11250w = 11.25kw