3. When a particle is projected at some angle to the horizontal, it has a range R and time of flight t1. If the same particle is projected with the same speed at some other angle to have the same range, its time of flight is t2, then 1) t1 + t2 = 2R/g 2) t1 - t2 = R/g 3) t1t2 =2R/g 4) t1t2 = R/g

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