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

Two blocks of masses `10kg` and `20kg` are connected by a light spring as shown. A force of `200N` acts on the `20kg` mass as shown. At a certain instant the acceleration of `10kg` mass is `12 ms^(-2)` towards right direction.

A

At that instant the `20kg` mass has an acceleration of `12ms^(-2)`

B

At that instant the `20kg` mass has an acceleration of `4 ms^(-2)`

C

The stretching force in the spring is `120N`

D

none of these

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