The tension of a rope in a tug of war with unequal forces is equal to the least force on the rope. Am I right? (If group A pulls the wire with 20 newton leftwards and the group B pulls with 30 newton. I expect that the tension is 20 newton.)
But the tension on the rope pulling a mass vertically upward is said to be equal to $mg+ma$.( where $m$ is the mass of the object being pulled, $a$ is the acceleration of the object)
How come the same situations bearing different answers?
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