A child swings a stone tied to a string counter-clockwise in a horizontal circle of radius r. When the stone is at the southern-most point of the circle, choose the correct pair of directions for (i) the stone’s velocity and (ii) the centripetal force acting on it.
a) (i) West, (ii) North
b) (i) East, (ii) North
c) (i) East, (ii) South
d) (i) North, (ii) East