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Average force of a truck crashing into a wall

A 3000kg truck crashes into a wall at 40km/hr and comes to a stop in 0.5 sec. What is the average force on the truck while it comes to a stop?

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The principle to take into account here is that the change in impulse of an object is equal to its change in momentum.

For impulse ...

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Explanations and formulas are presented to solve the problem.