Please show steps and reasonings behind the answer! Thank you

Momentum is very useful for analyzing car accidents. Here is one pOSSIble Situation. n )016 Acura RDX (mass = 1800 kg! was In the middle of a left turn when collided With a 2015 Dodge Grand Caravan (mass = 2100 kg}. The RDX was initially going Eastbound on Edlst Avenue, turning towards Northbound on Main Street. The Caravan was heading Westbound on [41st Avenue in the middle lane. The following skid marks are observed on scene. ." 1 P7 .' 3 i If 'I" \"'3'- It was a dry day, so p; = 1.0, pk: 0.? between the tire and the road. Based on the length of the skid marks after the crash, you can work out that just after the collision, the RDX had a velocity ohm-.3 m/s, 35 N of W} and the Caravan had a velocity of 6.9 m/s, 19" S of W \\ ' 7'1. . ' _. J"; ______ ._.- From the orientation of the RDX, it seems like the RDX had been heading at some unknown speed 35 E of N before the collision. a. What is the speed of two cars just before the collision? b. Given that you also observe a skid mark of 23.5 m for the Caravan before the collision, how fast, in km/h, was the Caravan going when its tires rst start to slide? C. Is this collision elastic, inelastic, or completely inelastic? d. Who do you think is at fault in this collision? Explain your reasoning