W = weight of steel ball = 14700 N
m = mass of steel ball = [tex] \frac{weight}{acceleration due to gravity} =\frac{W}{g} = \frac{14700}{9.8}=1500 kg [/tex]
h = height raised = 30 m
Potential energy gained is given as
U = mgh
U = 1500 x 9.8 x 30
U = 441000 J
t = time taken = 30 sec
P = power used
Power is given as
P = [tex] \frac{U}{t} [/tex]
inserting the values
P = [tex] \frac{441000}{30} [/tex]
P = 14700 Watt
