What is the upward acceleration of the 0.25 kg0.25\text{ kg}0.25 kg mass at the instant that the thread is cut?
3.7 m s−23.7\text{ m s}^{-2}3.7 m s−2
5.9 m s−25.9\text{ m s}^{-2}5.9 m s−2
7.4 m s−27.4\text{ m s}^{-2}7.4 m s−2
9.8 m s−29.8\text{ m s}^{-2}9.8 m s−2
