A mass of 4.0 kg, resting on a horizontal, frictionless surface, is attached on the right to a horizontal spring with spring constant 30 N/m and on the left to a horizontal spring with spring constant 50 N/m. If this system is moved from equilibrium, what is the effective spring constant?
A) "16 N/m"
B) "80 N/m"
C) "20 N/m"
D) "-20 N/m"

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The Answer of A mass of 4.0 kg, resting on a horizontal, frictionless surface, is attached on the right to a horizontal spring with spring constant 30 N/m and on the left to a horizontal spring with spring constant 50 N/m. If this system is moved from equilibrium, what is the effective spring constant?
A) "16 N/m"
B) "80 N/m"
C) "20 N/m"
D) "-20 N/m"

A Mass of 4