A single mass (m1 = 3.6 kg) hangs from a spring in a motionless elevator. The sp

Question

A single mass (m1 = 3.6 kg) hangs from a spring in a motionless elevator. The spring constant is k = 294.0 N/m. Now, three masses (m1 = 3.6 kg, m2 = 10.8 kg and m3 = 7.2) hang from three identical springs in a motionless elevator. The springs all have the same spring constant given above. Now the elevator is moving downward with a velocity of v = -2.6 m/s but accelerating upward at an acceleration of a = 3.9 m/s2. (Note: an upward acceleration when the elevator is moving down means the elevator is slowing down.) What is the magnitude of the net force on the middle mass?

Explanation / Answer

acceleration of 10.8kg =9.8-3.9=5.9 m/s2 kx=10.8*5.9 x=0.2167 m is the maximum stretchessd length among 3 springs

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