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A projectile is given an initial velocity of \( (\hat{i}+2 \hat{j}) \)
\( \mathrm{P} \) \( \mathrm{m} / \mathrm{s} \), where \( \hat{i} \) is along the ground and \( \hat{j} \) is along

W the vertical. If \( g=10 \mathrm{~m} / \mathrm{s}^{2} \). the equation of its trajectory is:
(1) \( y=x-5 x^{2} \)
(2) \( y=2 x-5 x^{2} \)
(3) \( 4 y=2 x-5 x^{2} \)
(4) \( 4 y=2 x-25 x^{2} \)
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