Three identical 8.50 kg masses are hung by three identical springs (Figure 1) . Each spring has a force Part D constant of 7.60 kN/m and was 12.0 cm long before any masses were attached to it. How long is the bottom spring when hanging as shown? (Hint: isolate only the bottom mass.) Express your answer with the appropriate units. ? IB= Value Units Submit Request Answer V Part E Figure How long is the middle spring when hanging as shown? (Hint: treat the bottom two masses as a system.) Express your answer with the appropriate units. ? IM= Value Units Submit Request Answer Part F