Two gliders are tied together by a string after they are connected together by a compressed spring on an airtrack. Glider A has mass of 200g and Glider B mass is unknown. The string is cut and the gliders fly apart. If Glider B has an acceleration of 5.00 cm/s2 to the right and the acceleration of Glider A to the left is 20.0 cm/s2, find the mass of Glider B.