Based on Flanagan (2019). You have an athlete who needs to improve his jump height. What determines how high he can jump?

Questions:
1. Based on Flanagan (2019). You have an athlete who needs to improve his jump height. What determines how high he can jump? (100 points).
2. Based on Flanagan (2019). Your athlete is performing a dumbbell biceps curl. During the concentric phase of this exercise, at a constant speed, the athlete realizes that the exercise is easy at the beginning (elbow fully extended), more difficult in the middle (at 90 degrees of elbow flexion) and easy again at the end (at 135 degrees of elbow flexion). Using concepts of biomechanics, explain why the athlete feels differences in external resistance during the concentric phase. If the client performed the same exercise with more speed, how would the LINEAR MOMENTUM be affected? (100 points).
Book:Biomechanics: A Case-based Approach Book by Sean P. Flanagan