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