Asingle mass (m1 = 4.4 kg) hangs from a spring in a motionless elevator. the spring constant is k = 275 n/m.
now, three masses (m1 = 4.4 kg, m2 = 13.2 kg and m3 = 8.8) 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 = -2.1 m/s but accelerating downward at an acceleration of a = -2.1 m/s2.
what is the magnitude of the net force on the middle mass?

magnitude of force on the middle mass 129.36 N

Explanation:

Given data:

m_1 = 4.4 kg

spring constant =  275 N/m

m_2 = 13.2 kg

m_3 = 8.8 kg

downward velocity = -2.1 m/s

acceleration of elevator = - 2.1 m/s^2

magnitude of force on the middle mass is calculated as

for middle mass m  is =  13.2 kg

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step-by-step explanation:

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answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )