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Puzzle - Answer

A weightless and perfectly flexible rope is hung over a weightless, frictionless pulley attached to the roof of a building.

At one end is a weight which exactly counterbalances a monkey at the other end.

If the monkey begins to climb, what will happen to the weight - will it remain stationary, will it rise or will it fall?

 [Ref: ZSXS]

Answer:
As the monkey climbs, the weight will rise by the same amount.

Why? As the monkey exerts a force to pull itself up, it increases the tension in the rope, which in turn causes the weight to rise at the same rate as the monkey.

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