The Achilles tendon is attached to the rear of the foot as shown in the figure.(Figure 1) When a person elevates himself just barely off the floor on the "ball of one foot," estimate the tension FT in the Achilles tendon (pulling upward). Assume the person has a mass of 78 kg and D is twice as long as d. and Estimate the (downward) force FB exerted by the lower leg bone on the foot.