Q.

In figure shown, pulleys are ideal. Initially the system is in equilibrium and string connecting m2 to rigid support below is cut. What is the initial acceleration (in m/s2) of m2? Given m1=9kg;m2=3kg

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answer is 5.

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Detailed Solution

At equilibrium 2T=m1g⇒T=45N   ......(i)T−m2g=T1   ......(ii) As string is at cut then T1=0T−m2g=m1a⇒45−30=3×aa=5m/s2
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In figure shown, pulleys are ideal. Initially the system is in equilibrium and string connecting m2 to rigid support below is cut. What is the initial acceleration (in m/s2) of m2? Given m1=9kg;m2=3kg