Although the injuries tend to be less severe, heading a soccerball carries many of the same dangers as getting hit by a blockeror tackler in a football game. Indeed, heading is now forbidden inmany youth leagues. In a very simple model, calculate the impulsegiven to the skull and its average acceleration when struck by asoccer ball. Assume that a headed soccer ball undergoes an elasticcollision lasting 0.7 ms in which it reverses direction. Considertwo different heading techniques: (i) where the head effectivelyrecoils on its own, independent of the body (ii) the head and bodyrecoil together. Do calculations for both youth players and foradults.
                                                Youth              Adult
Soccer ball mass(kg)Â Â Â Â Â Â Â Â Â Â Â Â Â 0.375Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.425
Speed of kicked ball(m/s)Â Â Â Â Â Â 20Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 35
Mass of skull(kg)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 3Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 5
Mass of entire body(kg)Â Â Â Â Â Â Â Â 30Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 60
