A moving cart collides with a stationary cart. The carts stick together and move at the same speed. Three situations are shown. Identify any that violate the law of momentum conservation. NOTE: The bricks on top of the carts have the same mass as the cart. The arrows represent the velocities of the carts. ++ Before Collision ++ Before Collision Before Collision At Rest + After Collision At Rest After Collision At Rest After Collision