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in Physics by (79.4k points)
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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` ?
image
A. graph `I`, only
B. graphs `I and II`, only
C. graphs `I and III`, only
D. graphs `I, II and III`.

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Best answer
Correct Answer - D
Acceleration is positive in all three graphs, so velocity increases in all three.

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