The thread is cut. What is the initial upward acceleration of the 0.60 kg0.60\text{ kg}0.60 kg instrument at the instant the thread is cut?
3.9 m s−23.9\text{ m s}^{-2}3.9 m s−2
6.5 m s−26.5\text{ m s}^{-2}6.5 m s−2
9.8 m s−29.8\text{ m s}^{-2}9.8 m s−2
16.4 m s−216.4\text{ m s}^{-2}16.4 m s−2
