Question

Julio hit a baseball. What caused the ball to change direction at the time of impact?

Answer 1

The answer is c. the force of his swing

At the time of the impact, there is a collision between two bodies moving in opposite directions. 

The force exerted on the ball causes the change of velocity.

Answer 2

Answer: The force of his swing

Explanation: When Julio hit the baseball, the ball changed the direction after the impact. The contact force exerted by the bat on the baseball when it swing caused the change in direction of the ball. The force exerted  in time t is causes change in momentum.

the force of gravity acts on the ball all the time. The speed of the ball is not a factor to change direction. The weight of the air exerts a drag on the ball which is also constant. Hence, only the force of swing caused the changed in the direction of the ball.