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A particle is moving in a straight line. The variation of position ‘x’ as a function of time ‘t’ is given as x = (t 3 – 6t 2 + 20t + 15) m. The velocity of the body when its acceleration becomes zero is

1. 6 m/s
2. 10 m/s
3. 8 m/s
4. 4 m/s

Correct answer: 8 m/s

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