A ball of mass $2.0 \mathrm{kg}$, moving at $3.0 \mathrm{m}{\mathrm{s}}^{-1}$, strikes a wall and rebounds with almost exactly the same speed. State and explain whether there is a change in

(a) The momentum of the ball

A ball of mass $2.0 \mathrm{kg}$, moving at $3.0 \mathrm{m}{\mathrm{s}}^{-1}$, strikes a wall and rebounds with almost exactly the same speed. State and explain whether there is a change in

(b) The kinetic energy of the ball.

(a) Define linear momentum.

 Determine the base units of linear momentum in the SI system.

 A car of mass $900 \mathrm{kg}$ Starting from rest has a constant acceleration of $3.5{ \mathrm{ms}}^{-2}.$ Calculate its momentum after it has travelled a distance of $40 \mathrm{m}$.

 This diagram shows two identical objects about to make a head-on collision. The objects stick together during the collision. Determine the final speed of the objects. State the direction in which they move.

(a) Explain what is meant by an:

(i) Elastic collision

(a) Explain what is meant by an:

(ii) Inelastic collision