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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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By Expert Faculty of Sri Chaitanya
a
25°
b
30°
c
60°
d
45°
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detailed solution

Correct option is D

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


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Assertion : When the velocity of projection of a body is made n times, its time of flight becomes n times.

Reason : Range of projectile does not depend on the initial velocity of a body.

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