7. [-/8 Points] l DETAILS I MY NOTES SERCP11 5.5.P.021. 0/5 Submissions Used | ASK YOUR TEACHER A block of mass 3.80 kg is placed against a horizontal spring of constant k = 865 N/m and pushed so the spring compresses by 0.0600 m. iR (a) What is the elastic potential energy of the block-spring system (in 1)? [ ] (b) If the block is now released and the surface is frictionless, calculate the block's speed (in m/s) after leaving the spring. m/s Need Help? [Cmman [Cwmenuc] Submit Answer 8. [-/8 Points] DETAILS MY NOTES SERCP11 5.6.P.032. 0/5 Submissions Used ASK YOUR TEACHER A 63-kg pole vaulter running at 10 m/s vaults over the bar. Her speed when she is above the bar is 1.2 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar. |m Need Help