A Cannon Shoots 5

A cannon shoots 5.0-kg cannon ball that carries a charge of 3.0 Coulombs at some angle above horizontal ground in a region in which there is a uniform electric field E and gravitational acceleration is straight down,-9.8 m/s² ŷ.If the ball travels half the horizontal distance before striking the ground that it would have if there were no electric field,what is the magnitude of the electric field?

A) + 16 N/C ŷ
B) -16N/C ŷ
C) + 49 N/C ŷ
D) -49 N/C ŷ
E) Cannot answer-the angle of launch is needed.