(a)[1]
State Newton’s second law of motion.
(b(i))[2]
A ball with mass $65\,\text{g}$ strikes a wall at a velocity of $5.2\,\text{m s}^{-1}$ perpendicular to the wall. The ball rebounds perpendicularly from the wall at a speed of $3.7\,\text{m s}^{-1}$. The time for which the ball is in contact with the wall is $7.5\,\text{ms}$. Calculate the change in momentum of the ball.
(b(ii))[1]
Calculate the size of the average force acting on the ball during the collision.
(c(i).1)[2]
For the collision between the ball and the wall in (b), state how Newton’s third law is applied.
(c(i).2)[1]
For the collision between the ball and the wall in (b), state how conservation of momentum applies.
(c(ii))[1]
State, giving a reason, whether the collision is elastic or inelastic.