A projectile is given an initial velocity of \( (\hat{i}+2 \hat{j}) \mathrm{m} / \mathrm{s} \), ...
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0A projectile is given an initial velocity of \( (\hat{i}+2 \hat{j}) \mathrm{m} / \mathrm{s} \), where \( \hat{i} \) is along the ground and \( \hat{j} \) is along thevertical. If \( g=10 \mathrm{~m} / \mathrm{s}^{2} \), the equation of its trajectory is
(1) \( y=2 x-5 x^{2} \)
(2) \( y=x-5 x^{2} \)
(3) \( 4 y=2 x-5 x^{2} \)
(4) \( y=2 x+5 x^{2} \)
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