An object with a mass of 4 kg is hanging from a spring with a constant of 3 (kg)/s^2. if the spring is stretched by 5 m, what is the net force on the object?

You should try drawing a free body diagram. It relly helped me in physics. If you did so you'll see that there are 2 forces acting on the object. The gravitational downwards pull and the resisting spring that's pulling it up. If you add those together by finding the difference you get a net force. Ask your teacher if you don't get any of these terms! 

mg=4*9.8m/s^2=39.2N
kx=3*5=15N
Net force=39.2-15=24.2N

The answer is option c.

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