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=u2sin2⁡θ2g and R=u2sin⁡2θg hR=45180=tan⁡θ4  or  θ=45∘
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