# Collision Force

Classical Mechanics Level 3

A car having a mass of $$2 \text{ Mg}$$ strikes a smooth, rigid sign post with an initial speed of $$30 \text{ km/h}$$. To stop the car, the front end horizontally deforms $$0.2 \text{ m}$$. If the car is free to roll during the collision, determine the average horizontal collision force causing the deformation.

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