A Model Rocket Sits on the Launch Pad Until Its

question 77

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 is less than the downward momentum of the fuel.
• D)of none of the above reasons.

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Definitions:

Base Value

A reference or initial value used for comparison or calculation purposes in finance and economics.

Rate of Decrease

A measure of how quickly a quantity is diminishing over time, often expressed as a percentage or a ratio.

Percentage

A portion or share expressed as a fraction of 100, commonly used to compare differences in quantities.

Percentage

A rate, number, or amount in each hundred, represented by the symbol %.