A Model Rocket Sits on the Launch Pad Until Its

question 49

Multiple Choice

A model rocket sits on the launch pad until its fuel is ignited, blasting the rocket upward. During the short time of blast-off, as the ignited fuel goes down, the rocket goes up because:

• A) the fuel pushes on the ground.
• B) air friction pushes on the escaping fuel.
• C) the downward force of gravity on the rocket is less than the rate of downward momentum increase of the fuel.
• D) of none of the above reasons.

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