Calculate the potential energy stored in an object of mass 50 kg at a height of 20 m from the ground.
(g=10 m/s2)
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potential energy=mgh

=50×10×20

=10000 J

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i just did this and got a 100.

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6