Two block of massesm1andm2are connected with a massless unstretched spring and placed over a plank moving with an accelerationaas shown in figure. The coefficient of friction between the blocks and platform is andmicro;. Choose the correct statements :a)spring will be stretched ifaandlt; andmu;gb)spring will neither be compressed nor be stretched for a andle;andmu;gc)spring will be stretched if aandgt; andmu;gd)spring will be compressed ifaandle;andmu;gCorrect answer is option 'A,B,C'. Can you explain this answer?

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Two block of masses m₁ and m₂ are connected with a massless unstretched spring and placed over a plank moving with an acceleration a as shown in figure. The coefficient of friction between the blocks and platform is µ. Choose the correct statements :

a)
spring will be stretched if a < μg
b)
spring will neither be compressed nor be stretched for a ≤ μg
c)
spring will be stretched if a > μg
d)
spring will be compressed if a ≤ μg

Correct answer is option 'A,B,C'. Can you explain this answer?

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Two block of massesm1andm2are connected with a massless unstretched sp...

Let the value of a be increased from zero. As long as a ≤ μg there shall be no relative motion between m₁ or m₂ and platform, that is, m₁ and m₂ shall move with acceleration a.
As a > µg the acceleration of m₁ and m₂ shall become µg each.
Hence at all instant the velocity of m₁ and m₂ shall be same
∴ The spring shall always remain in natural length.

The correct answers are: spring will be stretched if a < μg , spring will be compressed if a ≤ μg , spring will neither be compressed nor be stretched for a ≤ μg

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Two block of massesm1andm2are connected with a massless unstretched spring and placed over a plank moving with an accelerationaas shown in figure. The coefficient of friction between the blocks and platform is µ. Choose the correct statements :a)spring will be stretched ifa< μgb)spring will neither be compressed nor be stretched for a ≤μgc)spring will be stretched if a> μgd)spring will be compressed ifa≤μgCorrect answer is option 'A,B,C'. Can you explain this answer?

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