A machine shop grinding wheel accelerates from rest with a constant angular acceleration of 2.1rad/s^2 for 7.2s and is then brought to rest with a constant angular acceleration of -4.8 rad/s^2 .Find the total time elapsed.Find the total number of revolutions turned.

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i found the total time which it t=10.4s. but, i can not figure out how to find \[\Delta \phi\].

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