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A swimmer while jumping into water from a height easily forms a loop in air, if

1. He pulls his arms and leg in
2. He spreads legs and his arms
3. He keeps himself straight
4. His body is so formed

Correct answer: He pulls his arms and leg in

Solution

When the swimmer pulls in his arms and legs, his moment of inertia decreases. With angular momentum conserved in air, a smaller moment of inertia means a larger angular speed, so he can form a loop more easily.

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