Each of the three graphs represents acceleration versus time for an object that already has a po...

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Each of the three graphs represents acceleration versus time for an object that already has a positive velocity at time \( t_{1} \). Which graphs show an object whose speed is increasing for the entire time interval between \( t_{1} \) and \( t_{2} \) ?
- (a) graph I, only
(b) graphs I and II, only
(d) graphs I, II, and
- (c) graphs I and III, only
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