A pendulum has a length of 1.35m. What mass should be placed on a spring with a spring constant of 10.0N/m to have oscillations with the same period as the pendulum.

T=2•π•sqrt(l/g)

T= 2•π•sqrt(m/k)
sqrt(l/g) =sqrt(m/k)

L/g=m/k
Solve for ‚m’.