(1 point) A brick of mass 8 kg hangs from the end of a spring.
When the brick is at rest, the spring is stretched by 3920 cm. The
spring is then stretched an additional 2 cm and released with a
downward force of F(t)=143cos(6t) NF(t)=143cos(6t) N acts on it.
Assume there is no air resistance. Note that the acceleration due
to gravity, gg, is g=980g=980 cm/s22.
Find the spring constant N/cm
Set up a differential equation that describes this system....