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

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If tension in the spring is T then
For 10 kg block T-10xx10=100N
For 20 kg block `200-T=20a rArr 200-100=20arArr a=5m//s^(2)`
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