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the Range to be travelld by the projectile is L
let the velocity be 'u' , it is fired at an angle theta ,
so calculate the final energy at the starting point of the semicircular hollow ring ,where the projectile goes into the ring ,
the energy at which it enters should be equal to the energy at the point at which it exits,
at the exiting point the velocity is zero , range again has to L
so calculate the velocity , with the two equations
the range is the same , you know the radius of the semicircular ring energy equations have to be the same
equate them , you will get the answer ~
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