You redo the primitive yo-yo experiment (Figure 1), but instead of holding the free end of the string stationary, you move your hand vertically so that the tensian in the string equals 2Mg/3 what is the vertical accelaration of the yo-yo's center of mass? Does it accelerate upward or downward? Express your answer to three significant figures and include the appropriate units. Enter positive value if the acceleration is directed upward and negative value if the acceleration is directed downward. x Incorrect; Try Again; 3 attempts remaining