Question

An object with a mass of `3 kg` is hanging from a spring with a constant of `8 (kg)/s^2`. If the spring is stretched by `4 m`, what is the net force on the object?

Answer 1

2 N toward up

Explanation:

The object is subject to the weigh force `F= mg= 3 kg xx 10 m/s^2 = 30 N` toward down, and to an elastic force `F= K xx d = 8 (kg)/s^2 xx 4 m = 32 N` toward up.
net force =`F_(t) = 32-30 = 2 N` toward up