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Q.

The masses of 10 kg and 20kg respectively are connected by a massless spring as shown in figure. A force of 200 N acts on the 20kg mass. At the instant shown, the 10 kg mass has acceleration 12 m/s2. What is the acceleration of 20 kg mass?

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a

12 m/s2

b

4 m/s2

c

10 m/s2

d

Zero

answer is B.

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Detailed Solution

As the mass of 10 kg has acceleration 1 2m/s2 therefore it apply 120 N force on mass 20 kg in a backward direction.∴ Net forward force on 20 kg mass - 200 - 120= 80 N Acceleration of 20kg of mass =8020=4m/s2

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