plates are square with side length $=20\mathrm{.}0cm.$

$($a$)$ Describe the trajectory of the particle.

a straight line

a parabola

a circle

a helix

$($b$)$ Which plate does it strike?

negative plate

positive plate

It does not strike either plate.

$($c$)$ Where does it strike, relative to its starting point? $($Enter the horizontal distance from the initial position, in $m.$ If it does not strike either plate, enter $0.)$

m

$($d$)$ What If$?$ What is the minimum initial speed $($in $\frac{m}{s})$ the particle must have in order to change the answer to part $($b$)?$

$\frac{m}{s}$

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