An elevator is moving downward when someone presses the emergency stop button. The elevator comes to rest a short time later. After the button has been pressed but before the elevator has stopped, the velocity of the elevator is _______, and the acceleration of the elevator is _________.

A child throws a baseball directly upward. Immediately after the ball leaves the child's hand, the velocity of the ball is ________, and the acceleration of the ball is__________

A child throws a baseball directly upward. At the very top of the ball's motion (i.e. the point of maximum height), the velocity of the ball is _______, and the acceleration of the ball is ______.