What is the distance the spring is stretched from its unstretched length? d = 8.

Question

What is the distance the spring is stretched from its unstretched length? d = 8.8cm

Now, three masses (m1 = 2.8 kg, m2 = 8.4 kg and m3 = 5.6) 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? F = 54.88N

What is the distance the middle spring is stretched from its equilibrium length?  d = 44.2cm

Now the elevator is moving downward with a velocity of v = -2 m/s but accelerating upward at an acceleration of a = 4.5 m/s2.   (Note: an upward acceleration when the elevator is moving down means the elevator is slowing down.)

What is the magnitude of the force the upper spring exerts on the upper mass? F = 240.24N

What is the distance the lower spring is extended from its unstretched length? d = 25.8cm

What is the magnitude of the net force on the middle mass?

The last part that is the one I can solve I already solved the other and I can see the answers please show steps

Explanation / Answer

F_net = m a = 8.4 * 4.5 = 37.8 N

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