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Q.

Two bodies A and I of masses 20 kg and 10 kg respectively are connected by massless spring as shown in fig. A force of 200 N acts on 20 kg 

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mass. At the instant shown the t0 kg mass has acceleration of 72 mls2. What is the acceleration of mass 20 kg ?

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a

10 m/s2

b

12 m/s2

c

4 m/s2

d

0 m/s2

answer is B.

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Detailed Solution

According to Newton's law

F=m1a1+m2a2200=20×a1+10×12a1=(200−120)/20=4m/s2.

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