# An object with a mass of 6 kg is hanging from a spring with a constant of 12 (kg)/s^2. If the spring is stretched by  9 m, what is the net force on the object?

The net force $= 48 N$
The weight of the object (acting downwards) is $= 6 g = 60 N$
The force of the spring (acting upwards) is $= 12 \cdot 9 N = 108 N$
So there is a net force (acting upwards) of $= \left(108 - 60\right) N = 48 N$