Answer:
1568000 jule
Step-by-step explanation:
Gravitational potential energy,
Ep=mgh=40m×4000kg×9.8m/s^2
P.E = mgh
m = 4000kg, h = 40m, g = 10m/s^2
P.E = 4000 × 40 × 10
= 1600000J
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