Q.

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

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a

πu2g2

b

πu22g2

c

πug2

d

πu2g2

answer is A.

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Detailed Solution

A bullet fired at angle 45° will fall maximum away, and all other bullets will fall with this bullet fired at 45°. Rmax=u2g  Maximum area covered =πRmax2=πu2 g
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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