# A projectile is given an initial velocity of $(\hat{i} + 2 \hat{j}) m/s$, where $\hat{i}$ is along the ground and ˆj is along the vertical. If $g = 10 m/s^2$, the equation of its trajectory is:
( A ) $y = 2x - 5x^2$
( B ) $y = x - 5x^2$
( C ) $4y = 2x - 5x^2$
( D ) $4y = 2x - 25x^2$