The maximum height attained by a projectile is increased by \( 10 \% \) by increasing its speed ...

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The maximum height attained by a projectile is increased by \( 10 \% \) by increasing its speed of projection, without changing the angle of projection. The percentage increase in the horizontal range will be
(a) \( 20 \% \)
(b) \( 15 \% \)
(c) \( 10 \% \)
(d) \( 5 \% \)
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