A car of mass $1100 \mathrm{kg}$ is travelling at $24 \mathrm{m}{ \mathrm{s}}^{-1}$. The driver applies the brakes and the car decelerates uniformly and comes to rest in $20 \mathrm{s}$.Calculate the braking force on the car.

(c) A car of mass $1100 \mathrm{kg}$ is travelling at $24 \mathrm{m}{ \mathrm{s}}^{-1}$. The driver applies the brakes and the car decelerates uniformly and comes to rest. Determine the braking distance of the car.

A marble of mass $100 \mathrm{g}$ is moving at a speed of $0.40 \mathrm{m}{ \mathrm{s}}^{-1}$ in the $x$ -direction.

 Calculate the marble's momentum. The marble strikes a second, identical marble. Each moves off at an angle of $45°$ to the $x$ -direction.

A marble of mass $100 \mathrm{g}$ is moving at a speed of $0.40 \mathrm{m}{ \mathrm{s}}^{-1}$ in the $x$ -direction. Use the principle of conservation of momentum to determine the speed of each marble after the collision.

A marble of mass $100 \mathrm{g}$ is moving at a speed of $0.40 \mathrm{m}{ \mathrm{s}}^{-1}$ in the $x$ -direction. Show that kinetic energy is conserved in this collision.

A cricket bat strikes a ball of mass $0.16 \mathrm{kg}$ travelling towards it. The ball initially hits the bat at a speed of $25 \mathrm{m}{ \mathrm{s}}^{-1}$ and returns along the same path with the same speed. The time of impact is $0.0030 \mathrm{s}$. You may assume no force is exerted on the bat by the cricketer during the actual collision.

(a) Determine the change in momentum of the cricket ball.

A cricket bat strikes a ball of mass $0.16 \mathrm{kg}$ travelling towards it. The ball initially hits the bat at a speed of $25 \mathrm{m}{ \mathrm{s}}^{-1}$ and returns along the same path with the same speed. The time of impact is $0.0030 \mathrm{s}$. You may assume no force is exerted on the bat by the cricketer during the actual collision. Determine the force exerted by the bat on the ball.

A cricket bat strikes a ball of mass $0.16 \mathrm{kg}$ travelling towards it. The ball initially hits the bat at a speed of $25 \mathrm{m}{ \mathrm{s}}^{-1}$ and returns along the same path with the same speed. The time of impact is $0.0030 \mathrm{s}$. You may assume no force is exerted on the bat by the cricketer during the actual collision.Describe how the laws of conservation of energy and momentum apply to this impact and state whether the impact is elastic or inelastic.

 State the principle of conservation of momentum and state the condition under which it is valid.