The 2 photos above show a woman jumping on a Pogo Stick. In the photograph on the left she is in the air at her highest point whereas in the photograph on the right she is at her lowest point (notice that at this time the spring is compressed). The picture on the far right shows how the pogo stick is built. The woman is 168 cm tall and weighs 60 kg.
Calculate the [problem appears to be incomplete in the source]