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(A) When a charged particle enters a uniform electric field $\vec{E}$,it experiences an electric force $\vec{F} = q\vec{E}$.In this case,the electric

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Vertical velocity changes but horizontal velocity remains constant

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(A) When a charged particle enters a uniform electric field $\vec{E}$,it experiences an electric force $\vec{F} = q\vec{E}$.In this case,the electric field is directed along the vertical axis ($y$-axis),so the force acts only in the vertical direction.According to Newton's second law,the acceleration $\vec{a} = \frac{q\vec{E}}{m}$ is also directed along the vertical axis.Since there is no force acting along the horizontal axis ($x$-axis),the horizontal acceleration is zero $(a_x = 0)$.Therefore,the horizontal velocity $(V_x)$ remains constant.However,because there is a constant acceleration along the vertical axis,the vertical velocity $(V_y)$ changes over time.Thus,the vertical velocity changes while the horizontal velocity remains constant.

$A$ positively charged particle moving along the horizontal axis with a certain velocity enters a uniform electric field directed along the vertical axis. Its

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