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A 400 gm block B is suspended with unifo...

A 400 gm block B is suspended with uniform string S of mass 100gm and length 20cm as shown. Variation of tension T with distance x from the end block is hanging is T=4+4x, where T is (mN) anad x in meters. Find the value of K `(in N//m).(g=10m//s^(2)`

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