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A number of bullets are fired in all possible directions with the same initial velocity u. The maximum area of ground covered by bullets is :

(answer should come π (u square / g) square



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Range of a bullet is R = u² sin2Ф / g
The range is the radius of circular region, along the circumference of which the bullets will land.
SO area covered : 2 π R.     This is maximum for a given  velocity/speed when sin 2Ф = 1.

So  area = π (u²/g)²
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