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Two blocks of masses 10 kg and 20 kg are...

Two blocks of masses 10 kg and 20 kg are connected by a massless spring and are placed on a smooth horizontal surface. A force of 200 N is applied on 20 kg mass as shown in the diagram. At the instant, the acceleration of 10 kg mass is `12ms^(-2)`, the acceleration of 20 kg mass is:

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The correct Answer is:
4
Spring force `F_(s)` = Net force on 10 kg mass
`=10xx12=120N`
For 20 kg, `200-120 a rArr a=4 ms^(-2)`
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