Question

three masses (m1 = 3.7 kg, m2 = 11.1 kg and m3 = 7.4) hang from three identical springs in a motionless elevator. The springs all have the same spring constant given above.Finally, the elevator is moving downward with a velocity of v = -2.2 m/s but accelerating downward at an acceleration of a = -3.4 m/s2.
question:What is the magnitude of the net force on the middle mass?

Answer 1

got it!
f=11.1(3.4)
=37.74N