The tension in the inextensible string using pseudo-force concept is (in N) (Take g=10m/s2)
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Solution
The given system can be reframed as shown.
Using pseudo-force concept, we have
For 3kg body: T=3g+3a⇒a=T−3g3
For 7kg body: T+7a=7g⇒a=7g−T7
Hence, T−3g3=7g−T7 ⇒7T−21g=21g−3T ⇒10T=42g ⇒T=42N