A hockey puck is sliding on frictionless ice. It slams against a wall and bounces back toward the player with the same speed that it had before hitting the wall. Does the velocity of the hockey puck change in this process?

Yes

Yes, the velocity of the hockey puck changes during this process. Velocity is a vector quantity that includes both speed (magnitude of the motion) and direction. When the hockey puck hits the wall and bounces back, its direction of motion changes, and therefore its velocity changes as well.

In this process, the velocity of the hockey puck does change. Velocity is a vector quantity that includes both magnitude (speed) and direction. When the hockey puck hits the wall and rebounds, its direction changes. Therefore, the velocity also changes, even if the magnitude (speed) remains the same.