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Q.

The masses of 10 kg and 20 kg respectively are connected by a massless spring in fig. (4). A force of200 newton 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 ?

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a

12 m/sec2

b

4 m/sec2

c

10 m/sec2

d

zero

answer is B.

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Detailed Solution

Force on 10 kg mass = 10 x 1.2 = 120 NThe mass of 10 kg will pull the mass of 20 kg in the backward direction with a force of 120 N.∴Net force on mass 20 kg = 200 - 120 = 80 NIts acceleration =80N20kg=4m/s2

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