An airplane engine starts from rest; and 2 seconds later, it is rotating with an angular speed of 420 rev/min. If the angular acceleration is constant, how many revolutions does the propeller undergo during this time?
A)7
B)14
C)21
D)49
E)150

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The Answer of An airplane engine starts from rest; and 2 seconds later, it is rotating with an angular speed of 420 rev/min. If the angular acceleration is constant, how many revolutions does the propeller undergo during this time?
A)7
B)14
C)21
D)49
E)150

An Airplane Engine Starts from Rest; and 2 Seconds Later