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The figure shows a graph of ωz and αz versus time for a particular rotating body. (a) During which time intervals is the rotation speeding up? (i) 0 < t < 2 s; (ii) 2 s < t < 4 s; (iii) 4 s < t < 6 s. (b) During which time intervals is the rotation slowing down? (i) 0 < t < 2 s; (ii) 2 s < t < 4 s; (iii) 4 s < t < 6 s.
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