For questions $10-11$: A positive charge is placed at rest at the center of a region of space, in which there is a uniform, three$-$dimensional electric field. $($A uniform field is one whose strength and direction are the same at all points within the region.$)$

When the positive charge is released from rest in the uniform electric field, what will its subsequent motion be$?$

It will move at a constant acceleration.

It will move at a constant speed.

It will move at a constant velocity.

It will move with a linearly changing acceleration.

It will remain at rest in its initial position.