Masses 10 kg and 20 kg are connected by a massless spring. A 200 N force pulls the 20 kg mass. At an instant the 10 kg mass has acceleration 12 m s⁻² to the right. The acceleration of the 20 kg mass is:

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Masses 10 kg and 20 kg are connected by a massless spring. A 200 N force pulls the 20 kg mass. At an instant the 10 kg mass has acceleration 12 m s⁻² to the right. The acceleration of the 20 kg mass is:

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