I need help with 69 Solution6 final momentum of the car13600

I need help with 6-9!

Solution

6. final momentum of the car=(13600/9.8)x11.1=

7. momentum before collission= momentum of truck after collission in x- direction + momentum of car after collission in x-direction

= sqrt( 76812.2^2 - 9361^2) + 12919

= 76239.65 + 12919 = 89158.65 kg.m/s

8. speed before the collission = (89158.65 /69700) x 9.8 = 12.536 m/s