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A shell is fired from a fixed artillery gun with an initial speed u such that it hits the target on the ground at a distance R from it. If t 1 and t 2 are the values of the time taken by it to hit the target in two possible ways, the product t 1 t 2 is -

1. 2R/g
2. R/2g
3. R/g
4. R/4g

Correct answer: 2R/g

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