Net Force :
During acceleration phase net force is +ve as horizontal forces are unbalanced. When sprinter has achieved max speed and is at constant velocity the net force is 0. When sprinter is decelerating slightly at end of race net force is -ve as horizontal forces are unbalanced.
Stability:
' On your marks' = most stable due to low CoM, area of base of support is large and line of gravity is central to the base of support
'Set' = still stable but less stable as CoM is higher and the line of gravity is closer to the edge of the base of support.
'Bang' = sprinter unstable as lifting hands off the ground means that the line of gravity falls outside the base of support and CoM is higher.
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