Collision Force

A car having a mass of 2 Mg 2 \text{ Mg} strikes a smooth, rigid sign post with an initial speed of 30 km/h 30 \text{ km/h} . To stop the car, the front end horizontally deforms 0.2 m0.2 \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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