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A machine gun fires 23 g bullets horizontally at 260 m/s at a constant rate of 30 bullets/s.

(a) If the bullets embed themselves in a thick wooden door, what is the average force exerted on the door?

(b) If the bullets hit a steel door and rebound elastically (i.e., bounce straight back with the same speed that they hit the door), what is the average force exerted on the door?

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