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"Double The Fun?"  Experimenting with his toy rockets, Danny fires his model rockets three different ways. - First he places a model on the ground, free of obstructions, and fires.
- Next he braces an identical model against a stiff wall and fires.
- Third, he positions two identical models on the grounds with their tails butting, and fires them simultaneously.
How do the rocket accelerations in the three experiments compare?
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