Answers

2016-01-20T18:53:37+05:30
Vol. of water = weight of the water = Force needed to drag it up.
work done= F * S
490J = w * 12 m
w = 490/12
w = 40.8......
m*g = 40.8
m = 4.08...kg
m = 4.08 litres..
Hope this helped u
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