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The relation between time 't' and distance 'x' is t = α x 2 + β x, where α and β are constants. The relation between acceleration (a) and velocity (v) is:

1. a = – 3 α v 2
2. a = –5 α v 5
3. a = –2 α v 3
4. a = –4 α v 4

Correct answer: a = –2 α v 3

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