4. A left turning car (1160 kg) collides with a truck (2550 kg) who did not stop in time for a red light. Just before the collision, the car is travelling at 30 km/h heading 630 west of north, and the truck is travelling at 45 km/h heading south. After the collision, the car has a heading of 230 S of W, and the truck has a heading of 77 S of E. What is the speed of the car just after the collision, in km/h? (Hint: You can keep all the speeds in km/h for your calculations.) Bonus: What is the magnitude of the impulse experienced by the car, in kgm/s? If the collision lasted 0.08 s, what is the magnitude of the average acceleration experienced by the car during the collision? Express this number in g's. EP, + ADext = EPZ EP, = EPZ m, V , + my v z = m, V , + my vz unknowns mc Vc; + MT VTi = mc Vey \\ + MT Vif x direction : - mcVc; sin 63 + 0 = - mcVcf cos 23 + my VTX cos 770 y direction : mcVci Cos 630 - MTVTi = - mcvef sin230 - my Vry sin 770