# An object with a mass of 8 kg is hanging from a spring with a constant of 9 (kg)/s^2. If the spring is stretched by  5 m, what is the net force on the object?

Jul 8, 2017

The net force is $= 6.4 N$ acting downwards

#### Explanation:

The mass is $m = 8 k g$

The spring constant is $k = 9 k g {s}^{-} 2$

Resolving in a vertical direction ${\uparrow}^{+}$

The net force is

$F = k \cdot x - m g$

$= 8 \cdot 9 - 8 \cdot 9.8$

$= - 6.4 N$