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A koala hangs onto a rope.
The weight on the other side of the pulley balances the koala.
From the start everything is stationary and there is balance.
What happens when the koala starts to climb the rope?
The pulley is frictionless.
There is friction between the koala and the rope, and therefore the koala can grip the rope.
Assume the rope has no mass, and that it doesn't matter how much rope is on either side of the pulley.
The rope is inextensible.
The koala climbs and does not swing on the rope
A. Both the koala and the weight go up with equal acceleration.