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**hooke's law and shm help plz**

## Homework Statement

a 4 kg mass is placed on a spring (k = 40n/m) which hangs vertically. the mass is allowed to oscillate in shm. the maximum distance the mass travels in any one direciton is 30cm

## Homework Equations

k = 40 n/m

distance = 30 cm

mass = 4 kg

Fspring = -kx

net force = Fspring-mg

## The Attempt at a Solution

Fspring = -kx

Fspring = -(40) (.3) = -12 (wrong answer)