Q.
A shell fired from the ground is just able to cross horizontally 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
25°
b
30°
c
60°
d
45°
answer is D.
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Detailed Solution
h=u2sin2θ2g and R=u2sin2θg hR=45180=tanθ4 or θ=45∘
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