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From the moment the engine is switched off, an airplane propeller which rotates at a speed of 1200 rpm performs 80 revolutions until it comes

From the moment the engine is switched off, an airplane propeller which rotates at a speed of 1200 rpm performs 80 revolutions until it comes to a complete stop. Assuming decelerated accelerated motion, on demand: a) the total duration of the movement?b) the angular velocity and the angular acceleration at the instant the engine is switched off?

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