a) Explain why the cushion of a billard table is made to receive the impact of the billard ball at height of 0.7 d where d is the diameter of the ball.
b) With what part of a sabre should an object be slashed in order that the user does not feel the impact on the hand? Consider the sabre as a uniform lamina.
[Hint: In either case if the striking point is at such a distance that the lower point remains at rest, there will a rise no force. Such a point is called center of impact].

Answer

(b)`2/3` of its length from the handle