Two masses 10 kg and 20kg resplectivley are connected by a massless spring as shown in figure. A force of 200 N acts one the 20 kg mass.At the instant shown is figure the 10 kg mass has acceleration of 12 `m//s^(2)`.The vlalue of acceleration of 20 kg mass is

Explanation

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)`