1. The problem statement, all variables and given/known data A high-jumper with a mass of 65kg just clears a height of 2.13m and drops onto a 0.30m thick landing mat. a) What average net force does the landing mat exert on the high jumper if it is compressed by 0.18m during landing? b) What would be the effect on the force if the high-jumper were to land in sand that compresses only 5cm I managed to figure out the potential energy to be= 1356.81J and the Velocity = 6.46 ms/-1 Answers: a) 7100N b) 27,000J 2. Relevant equations Ek=1/2mv2 Ep=mgh W=Fs=Change in energy F=ma F=mg 3. The attempt at a solution Cannot figure out average net force. I've tried a lot of things and even tried working backwards from the answer and cannot get anywhere. I just would like to know how to figure the average net force and the second question with the given information.