Consider the motion of the tip of the minute hand of a clock. In one houra) the displacement is zerob) the distance covered is zeroc) the average speed is zerod) the average velocity is zero

In one hour, the minute hand rotates through an angle of 3600, i.e. the tip of the minutes hand moves along the circumference of a circle and returns to the same point where it started. so displacement of the tip of the minute hand is zero. Since average velocity = Displacement/Time interval, average velocity is also zero.