An object is rotated vertically using a string $($so rotates up and down$).$ The string is

$0\mathrm{.}5$m long, and the object has a mass of $300$g$.$ If the object rotates at $1\mathrm{.}2$ rotations per

second, how large is the tension on the string at $($A$)$ the top and $($B$)$ the bottom of the

circle?