$2\mathrm{.}1.$ A car has a total mass of $1200kg$ and is traveling at $100km.$h$-^1$ when the driver experiences a brake$-$failure and collides with

the barrels. Calculate the change in momentum it will

experience whilst coming to a standstill. Remember to use SI

units.

$2\mathrm{.}2.$ Calculate the force the car experiences if it is in contact with

the water barrels for $2\mathrm{.}5$ seconds.