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The masses of 10 kg and 20 kg respective...

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

A

`12 m//s^(2)`

B

`4 m//s^(2)`

C

`10 m//s^(2)`

D

Zero

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