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@lpg
1/2 mv^2.
Kinetic energy of 80kgs at 25mph = 0.5*80*11.17^2=5kJ of energy
say you and bike weigh 65kgs ...0.565 x m/s = 5kJ ..x = 12.5
you need to go at roughly 28.0mph to do the same damage as an 80kgs object. it's more to do with speed than how heavy you are.