Question

A 50.0 kg girl bounces up and down on a pogo stick. The girl has an instantaneous acceleration of 2.0 m/s^2 when the displacement is -8.0cm. What is the spring constant of the pogo sticks spring?

Answer 1

The spring force at that time (if accelerating upwards) is
F = m (g + a) = 590 N

The spring constant is 590 N/0.08 m