From questions on http://www.glenbrook.k12.il.us/GBSSCI/PHYS/CLASS/newtlaws/u2l4a.html
1. The fore is equal on both the firefly and the bus.
2. D) Rockets do accelerate in space because they push on the expanding gas.
3. C) the same size as the acceleration of the bullet.
4. C) the force is the same in each case.
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