The average velocity during impact for a falling object can be calculated using the formula vave = (v1 + v0)/2, where v1 is the final velocity and v0 is the initial velocity. In the case discussed, the boy's final velocity upon impact is 7.68 m/s, and assuming he starts from rest, the initial velocity is 0 m/s. The calculated average velocity during impact is therefore 3.84 m/s. Additionally, it is clarified that weight is a force measured in Newtons, with the boy's weight being 700 N, derived from his mass of 70 kg and gravitational acceleration of 10 m/s².
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