Suggest a suitable physical situation for each of the following graphs (Fig.3.22).

(a) A ball kicked towards a wall with constant velocity. Initially the ball is at rest and moves with constant velocity when kicked and hits the wall bounds back with certain velocity and comes to rest.

(b) A ball thrown from certain height vertically downwards. Thrown ball hits ground and bounces again and again until it reaches velocity zero (rest).

(c) Hammer moving with constant velocity to hit the nail. Initially acceleration zero (constant velocity) when hammer hits nail it produces jerk for short time and again comes to initial position (acceleration is zero).