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Grade 11Mechanics

In that 43rd question can u please briefly explain the process

Question image for In that 43rd question can u please briefly explai
Profile image of Trisha
6 Years agoGrade 11
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Profile image of ROSHAN MUJEEB
6 Years ago
In circular motion , N-mgcostheta=mv^2/R
theta is the angle with the vertical
N=0 and v=0 when theta=90
also change in potential= gain in kinetic
so mgR=1/2 *m*u^2
u=root(2gR)

Now applying WE theorem for spring
x(compression in spring) is root(m/k)*root(2gR)