a 50 kg crate is lifted to a height of 10 meters.?

Question

1) how much potential energy does the crate have after being lifted?
please show formula
2) if it took 5 seconds to lift the crate using a machine what was the power of the machine?
please show formula

Answer 1

1)Potential Energy =Ep=mgh where
m= mass
g= acceleration of gravity of the earth ~ 9.8 m/s^2
h= height
Ep=50 * 9.8 * 10=4900 J

2)Power = P = Ep/t where
t= Time
P=4900/5 =980 J/s

Answer 2

PE = mgh
PE = 50*9.8*10
PE = 4900 J

Power = Change in Energy/ Time
Power = 4900/5
Power = 980 J/s or W