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Two masses of 10 kg and 20 kg respectively are connected by a massless spring as shown in the figure. A force of 200N acts on the 20kg mass. At the instant shown the 10kg mass has acceleration `12 m//s^(2)`. What is the acceleration of 20 kg mass:-

A

`4 ms^(-2)`

B

`12 ms^(-2)`

C

`20 ms^(-2)`

D

`8 ms^(-2)`

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The correct Answer is:
A
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