(a)[1]
Explain why momentum should be regarded as a vector quantity.
(b)[4]
Calculate (i) the car’s change in momentum, (ii) the average force on the car.
(c)[3]
(i) The energy absorbed by the crumple zone is $4.3 \times 10^{5}\,\text{J}$. Show that the car’s speed before the collision is $24\,\text{m s}^{-1}$. (ii) Suggest what would happen to the car if it is travelling faster than $24\,\text{m s}^{-1}$ when it hits the wall.