Now, three masses (m1 = 4.3 kg, m2 = 12.9 kg and m3 = 8.6) hang from three identical springs in a motionless elevator. the springs all have the same spring constant given above. what is the magnitude of the force the bottom spring exerts on the lower mass? rank the distances the springs are extended from their unstretched lengths:

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600