Physics homework question?

In the movie Car Escape, Taylor and Jones drove their sports car across a horizontal car park in building 1 and landed it in the car park of building 2, landing on one floor lower. Building 2 is 20 meters from building 1. The floor where the car lands in building 2 is 4.0m below the floor from which it started in building one. Treat the car as a point participle and assume air resistance is negligible. After landing, Taylor applies the brakes and the car slows down until its speed is 11.0m/s. The car then collides head on with a concrete pillar. The car comes to rest in a time of 0.10s. The car comes to rest against the pillar. The mass of the car and the occupants is 1.30 tonne. Determine the average force on the car during the impact with the pillar. Show all working