$(20$ points$)$ use the diagram below for this question

If a soccer player goes to kick a heavy ball that weighs $20$ kg :

a$)$ What is the minimum force in the quadriceps necessary to move the ball? Assume that the

quadriceps always acts at an oblique angle of $30$ with respect to the lower leg bone. Also

assume that the only force related to the ball is due to its mass and gravity. Put your answer

in terms of $x,Y$ and $.$

b$)$ If $x=40cm$ and $Y=10cm,$ what is the required force in the quadriceps if $=45$ vs$.=5?$