A small block with mass $0\mathrm{.}0425$ kg

slides in a vertical circle of radius $0\mathrm{.}600$ m

on the inside of a circular track. During one of the revolutions of the block, when the block is at the bottom of its path, point A

$,$ the magnitude of the normal force exerted on the block by the track has magnitude $3\mathrm{.}80$ N

$.$ In this same revolution, when the block reaches the top of its path, point B

$,$ the magnitude of the normal force exerted on the block has magnitude $0\mathrm{.}685$ N