The Achilles tendon is attached to the rear of the foot as shown in (Figure 1) . A person elevates himself just barely off the floor on the "ball of one foot." Assume the person has a mass of 80kg and D is twice as long as d.Find the tension FT in the Achilles tendon (pulling upward).

Answer 1

weight = 80*9.81 Newtons

I do not have your diagram but assume a fulcrum and two lever arms in which case

weight * lever arm from weight to fulcrum = tension * lever arm from fulcrum to tendon