A block is projected with a speed `v_(0)` strikes the point pf projection after descr

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A block is projected with a speed `v_(0)` strikes the point pf projection after describing the path as shown in figure by dotted line. If friction exists for the path of length d and the vertical circular path is smooth, assuming coefficient of frictioin to be `mu` (A) Find `v_(0)`? (B) What is the minimum value of `v_(0)` ?
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