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AOB is a smooth semicircular track of ra...

AOB is a smooth semicircular track of radius r. A block of mass `m` is given a velocity `sqrt(2rg)` parallel to track at point A. Calculate normal reaction between block and track when block reaches at point O.

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`1/2mv_0^2=1/2mv_A^2+mgimplies(mv_0^2)/(r)=2mg+2mg=4mg`
`N=mg+(mv_0^2)/(r)=5mg`
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CENGAGE PHYSICS-WORK, POWER & ENERGY-Exercise 8.4
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