A reference point is a place or object used for comparison to determine if something is in motion.
An object is in motion if it changes position relative to a reference point. You may also assume that the reference point is stationary, or not moving.
An object's motion is its change of distance or position from the reference point.
A ball is moving from the left side of the court to the right. If you use the left ring as the reference point, the bal is moving farther. But if you use the right ring as the reference point, then the motion of the ball is that it is getting nearer.
because when it taste good the people convince to buy even how expensive it is
Because motion is the change in position with respect to frame of reference