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Tarzan , who weighs 800N , swings from the cliff at the end of a vine 20 m long (see figure).

From the top of the cliff to the bottom of the swing, he descends by 5 m.The vine will break if the force on it exceeds 1250 N.

What is the greatest force (in N) on it during the journey.

**Details** :

- If you thinks vine breaks during the swing, put your answer as 0.
- Take \(g = 10 m/s^2\)

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