If a cage containing a truck of coal weighing 7... - JAMB Physics 2009 Question
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 option: c
Power = (work done)/time taken = (mgh)/t
= (750 x 10 x 90)/60 = 11250w = 11.25kw
= (750 x 10 x 90)/60 = 11250w = 11.25kw
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