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Q.

Two blocks of masses 10kg and 20kg are connected by a massless spring and are placed on a smooth horizontal surface. A force of 200N is applied on 20 kg mass as shown in the diagram. At the instant, the acceleration of 10kg mass is 12ms–2, the acceleration of 20kg mass is,
 

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a

20 ms–2

b

4 ms–2

c

8 ms–2

d

12 ms–2

answer is A.

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Detailed Solution

Force induced in the spring = 10 x 12N = 120N
 

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Acceleration of 20kg mass = a20 kg=200-12020=8020=4 ms2

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