6. Explain the energy transformations involved in pole vaulting. Show the transformations involved from running down the track > halfway to the top when pole is flexed and bowed > summit of the jump. 7. A skier starts from rest at the top of a frictionless incline of height 20 m as shown here. How fast is the skier travelling at the bottom of the hill? Show all work starting with Ebefore = Eafter- P\" L _____ l _____ 200f~