When the Atwoods system is unabalanced, the acceleration vector of the ascending and descending masses is ?
opp
equal
zero
When the forces are unbalanced, then the net Acceleration acts in the same direction of the gravitational force on the heavier object.
So if direction of Acceleration in heavier object acts in downward direction, then the acceleration acts on the other side must be in upward direction.
Hence, option (a) is correct
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