In which case, positive work is done with least resistance?

1.	In which case, positive work is done with least resistance?
A.	While there is electric current in a conductor
B.	While a ball is rolling on a horizontal levelled floor
C.	While a ripe fruit is falling from a tree
D.	While a helicopter is rising up from the ground
Answer» D. While a helicopter is rising up from the ground

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In which case, positive work is done with least resistance?

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