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

A

`12 m//s^(2)`

B

`4 m//s^(2)`

C

`10 m//s^(2)`

D

Zero

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