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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
[JEE (Main) 2019]
(a) \( R / 2 g \)
(b) \( R / 4 g \)
(c) \( R / g \)
(d) \( 2 R / g \)
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