Each of the three graphs represents acceleration versus time for an...

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Each of the three graphs represents acceleration versus time for an object that already has a positive
\( \mathrm{P} \) velocity at time \( t_{1} \). Which graphs show an object

W whose speed is increasing for the entire time interval between \( t_{1} \) and \( t_{2} \) ?
(1) graph I, only
(2) graphs I and II, only
(3) graphs I and III, only
(4) graphs I, II and III
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