The question is impossible to answer exactly without more environmental information. In theory, with gravity and in a vacuum, a 45 degree angle would cause the ball to travel the farthest.
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Slightly to the right because a normal soccer player shoots with their right foot so the angle would help the shot by more speed being put on the ball.
the optimal angle of ball strike for optimal ball travel is 45 degrees. depending on field position and intended position of goal angle should be measured the player at any given moment