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Question

The masses of 10 kg and 20 kg respectively are connected by a massless spring as shown in figure. A force of 200 N 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

A
12 m/sec2
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B
4 m/sec2
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C
10 m/sec2
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D
Zero
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Solution

The correct option is B 4 m/sec2
As the mass of 10 kg has acceleration 12 m/sec2 therefore it apply 120N force on mass 20kg in a backward direction.
Net forward force on 20 kg mass = 200 – 120 = 80N
Acceleration=8020=4 m/s2

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