physics question

1-What is the shape of the trajectory of a charged particle moving in a uniform electric field if its initial velocity is null?
2-What is the shape of the trajectory of a charged particle moving in a uniform electric field if its initial velocity is perpendicular to the field?
3-What is the expression of the acceleration of a charged particle of mass m and charge q moving between two parallel plates a distance d apart between which a potential difference U is applied?

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