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Q.

A shell fired from the ground is just able to cross in a horizontal direction the top of a wall 90 m away and 45 m high. The direction of projection of the shell will be:

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a

250

b

300

c

600

d

450

answer is D.

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Detailed Solution

h = u2sin2θ2g and R = u2sin2θg45180 = 14tanθ or θ = 450
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