a load of mass120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms-2]
-
A.
60W -
B.
80W -
C.
100W -
D.
120W
Correct Answer: Option B
Explanation
p = (frac{mgh}{t} = frac{120 times 10 times 2}{30} = 80W)