A small ball is shot vertically upward by a compressed spring. The spring is compressed to point PPP and released, propelling the ball upward. The ball leaves the spring at point QQQ and reaches its maximum height at point RRR$.$ Assume air resistance is negligible.

Which of the following statements about the acceleration of the ball is correct?

The acceleration of the ball was the same for all points in its trajectory from QQQ to RRR$.$

The acceleration of the ball was greatest just before it reached point QQQ $($while still in contact with the spring$).$

The acceleration of the ball was decreasing as it moved from QQQ to RRR$.$

The acceleration of the ball is constant from QQQ to RRR$,$ reverses sign at RRR$,$ and remains constant again as the ball travels back down from RRR to QQQ$.$

The acceleration of the ball was zero at point RRR$.$