A man is on a merry$-$go$-$round that has a rim on the outer edge. He sees a marble sitting against the rim, so he moves it 1.00$\mathrm{}\mathrm{}\mathrm{}\mathrm{}$ meter away from the rim. The mass of the marble is 0.20kg,$$ the radius of the merry go$-$round is 10.0 meters. 

$($A)$)$ Describe the motion of the marble when the man releases it.

$($B)$)$ Explain the motion in terms of an observer in an inertial frame of reference and a non−$-$inertial frame of reference.