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/sec2. What is the acceleration of 20 kg mass?

(1) 12 m/sec2

(2) 4 m/sec2

(3) 10 m/sec2

(4) Zero

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Spring force
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