It's gonna crash!

In a crash test, a 1.51.5 metric ton vehicle collides a brick wall. The initial velocity of the vehicle is vi=10 m/sv_{i}=-10\text{ m/s} while its final velocity is vf=2.6 m/sv_{f}=2.6\text{ m/s}. If the collision lasts for 0.20.2 seconds, what is the average force (in Newtons) exerted on the vehicle due to the collision?

Image credit: Wikipedia Brady Holt
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