A ball is projected from a certain point on the surface of a planet...

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A ball is projected from a certain point on the surface of a planet at a certain angle with the horizontal
\( \mathrm{P} \)
surface. The horizontal and vertical displacement
W
\( x \) and \( y \) varies with time \( t \) in second as:
\[
x=10 \sqrt{3} t \text { and } y=10 t-t^{2}
\]

The maximum height attained by the ball is
(1) \( 100 \mathrm{~m} \)
(2) \( 75 \mathrm{~m} \)
(3) \( 50 \mathrm{~m} \)
(4) \( 25 \mathrm{~m} \)
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