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the thrust and the lift reduced by the pilot

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A pilot suddenly jettisons 2800 N of fuel. If the plane is to continue moving with the same velocity under the influence of the same air resistance R, by how much does the pilot have to reduce:

a) the thrust, and
b) the lift?

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The solution shows how to find the amount of thrust and the lift reduced by the pilot in order to maintain the same velocity.

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