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Q.

Each of the three graphs represents acceleration versus time for an object that already has a positive velocity at time t1. Which graphs show an object whose speed is
increasing for the entire time interval between t1 and t2? 

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a

graph I, only

b

graphs I and II, only

c

graphs I and III, only

d

graphs I, II and III

answer is D.

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Detailed Solution

Acceleration is positive in all three graphs, so velocity increases in all three.

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