# 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?

The object is subject to the weigh force $F = m g = 3 k g \times 10 \frac{m}{s} ^ 2 = 30 N$ toward down, and to an elastic force $F = K \times d = 8 \frac{k g}{s} ^ 2 \times 4 m = 32 N$ toward up.
net force =${F}_{t} = 32 - 30 = 2 N$ toward up