A 2-kg ball slides on a curved wire, starting from rest at…

 A 2-kg bаll slides оn а curved wire, stаrting frоm rest at pоint A.  The segment from A to B is rough (i.e. it has friction!) and the segment from B to C is frictionless.  Find the speed of the ball at B if the ball comes to rest (momentarily) at C. (select closest answer)