Car crash stimulus calculations

[omgplshelpme]

there is a car crash where car A is resting at the traffic lights and car B is driving at 100km/hr and at 45m saw the car and stepped on the brakes.

the velocity of car B is 27.8m/s
the deceleration is -6.7 m s^-2
the thinking distance is 41.7m
weight of car B is 1385 kg
weight of car A is x

i have to calculate the momentum, force, coefficient force and velocity etc...

i really need help

ty

 

[tiny-tim]

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hi omgplshelpme! welcome to pf!

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Show us what you've tried, and where you're stuck, and then we'll know how to help!

 

[omgplshelpme]

ok i have calculated the momentum of both cars and the momentum before the collision is greater then the momentum after the collision, have i done something wrong? momentum before is suppose to equal momentum after

ah I am so confused

 

[tiny-tim]

hi omgplshelpme!

show us your full calculations ​