A baseball is hit upward and travels along a parabolic arc before it strikes the ground. Which one of the following statements is necessarily true?
1. The acceleration of the ball decreases as the ball moves upward.
2. The velocity of the ball is 0 m/s when the ball is at the highest point in the arc.
3. The X component of the velocity of the ball is the same throughout the balls flight.
4. The acceleration of the ball is 0 m/s squared when the ball is at the highest point in the arc.
5. The velocity of the ball is a maximum when the ball is at the highest point in the arc.