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Think of a free body diagram on the object. It begins with no forces but a constant vertical speed. When it enters the field, a horizontal force is applied to it. This means it will begin to accelerate in the horizontal direction of the force (since the forces on the particle are unbalanced in that direction) but it will continue to move vertically at the same vertical speed (since there are no forces acting in that direction to speed it up or slow it down).


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