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Two blocks of masses M 1 and M 2 are connected to each other through a light spring as shown in figure. If we push mass M 1 with force F and cause acceleration a 1 in mass M 1 , what will be the magnitude of acceleration in M 2 ?

1. F/M 2
2. F/(M 1 + M 2 )
3. a 1
4. (F – M 1 a 1 )/M 2

Correct answer: (F – M 1 a 1 )/M 2

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