22. To help reduce the severity of accidents, an engineering company designs large plastic barrels filled with antifreeze that can be placed in front of bridge supports. In a simple test, a 1200 kg car moving at 20 m/s [W] crashes into several barrels. The car slows down to 8.0 m/s [W] in 0.40 s. a) Find the average net force acting on the car during the collision. b) What would happen to the average net force if the car in the test hit a bridge support directly, instead of the barrels? Explain your reasoning. You may assume that the bridge supports are not severely damaged during the collision. c) Why is it important to use antifreeze in the barrels, instead of just water, if the barrels will be used in Canada? Explain by discussing the effect this would have on the net force. 23. A stationary 2000 kg cannon fires a 25 kg cannon ball horizontally at 250 m/s. Find the velocity of the cannon after firing the cannon ball. You may assume that there is no friction acting on the cannon.

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