I have a physics problem. Please help

Posted on 2014-11-28 06:58:00 in Physics by CLARA

A wheel is rotating about an axis that is in the z-direction. The angular velocity ?z is
?6.1
rad/s at t = 0, increases linearly with time, and is +7.15 rad/s at t = 6.00 s. We have taken counterclockwise rotation to be positive.
During what time interval is the speed of the wheel increasing?
I got ---2 s < t < 3 s

Decreasing?
I got -- 4 s < t < 5 s
I can t solve this part?
*(c) What is the angular displacement of the wheel at t = 6.00 s?---- I can t solve it!!
please help me

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