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**A machine rotates at an angular velocity of 1.6rad/s. Its velocity is then increased to 6.2rad/s at an angular acceleration of 0.7rad/s**

^{2}. (a) How many revolutions does it make during its acceleration? (b) How long does the acceleration take?Sorry I'm not quite sure as how to approach this problem, and I don't even know where to begin. Any advice would be greatly appreciated.