The wagon is coasting at a speed vA all along a straight and level road. If 20.3% of the wagon's mass is thrown off the wagon, parallel to the ground and in the forward direction, the wagon is brought to a halt. When the direction in which this mass is thrown is precisely reversed, however the speed of the mass is relative to the wagon remains the similar, the wagon accelerates to a latest speed vB. Compute the ratio of vB/vA.