A particle is projected with a velocity v such that its range on the horizontal plane is twice the greatest height attained by it. The range of the projectile is (where g is acceleration due to gravity)
A
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B
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C
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D
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Solution
The correct option is A We know R=4Hcotθ 2H=4Hcotθ⇒cotθ=12;sinθ=2√5;cosθ=1√5[AsR=2Hgiven]Range=u2.2.sinθ.cosθg=2u22√5.1√5g=4u25g