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In that 43rd question can u please briefly explain the process
In circular motion , N-mgcostheta=mv^2/Rtheta is the angle with the verticalN=0 and v=0 when theta=90also change in potential= gain in kineticso mgR=1/2 *m*u^2u=root(2gR)Now applying WE theorem for springx(compression in spring) is root(m/k)*root(2gR)
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