A shell fired from the ground is just able to cross horizontally the top of a wall \( 90 \mathrm...

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A shell fired from the ground is just able to cross horizontally the top of a wall \( 90 \mathrm{~m} \) away and \( 45 \mathrm{~m} \) high. The direction of projection of the shell will be
(1) \( 25^{\circ} \)
(2) \( 30^{\circ} \)
(3) \( 60^{\circ} \)
(4) \( 45^{\circ} \)
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