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 12m/sec2. What is the acceleration of 20 kg mass
A
12m/sec2
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B
4m/sec2
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C
10m/sec2
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D
Zero
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Solution
The correct option is B4m/sec2 As the mass of 10 kg has acceleration 12m/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=4m/s2