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A body travels 102.5 m in n th second and 115.0 m in (n + 2) th second. The acceleration is :

1. 9 m/s 2
2. 6.25 m/s 2
3. 12.5 m/s 2
4. 5 m/s 2

Correct answer: 6.25 m/s 2

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