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A particle of mass \( m \) and charge \( -q \) is projected from the origin with a horizontal speed \( v \) into an electric field of intensity
\( \mathrm{P} \) \( E \) directed downward. Choose the wrong statement. Neglect gravity :
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Figure 1.400
(A) The kinetic energy after a displacement \( y \) is \( q E y \)
(B) The horizontal and vertical components of acceleration are \( a_{x}=q E / m, a_{y}=0 \)
(C) The equation of trajectory is \( y^{2}=\frac{1}{2}\left(\frac{q E x^{2}}{m v^{2}}\right) \)
(D) The horizontal and vertical displacements \( x \) and \( y \) after a time \( t \) are \( x=v t^{2} \) and \( y=\frac{1}{2} a_{y} t^{2} \)
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