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 `12" m"//"s"^(2)`. What is the acceleration of 20 kg mass?

`12 m//s^2`

`10 m//s^2`

`4 m//s^2`

`zero

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