1. The problem statement, all variables and given/known data When a mother lifts he child with her foot (as shown in figure) what force should the upper muscle exert to lift her child at a constant speed? 2. Relevant equations W = F x D f = mg I think these might be the right equations to use, correct me if I'm wrong. 3. The attempt at a solution I'm not sure if I need to add up the forces and distances shown in the figure? If I did W would be: W = (0.2m + 0.38m)(39N + 98N) W = 0.58 x 137 = 79.46Nm Do I need to convert kg into N? f = mg f = 137N x 9.80 m/s f = 1342.6 Is this at all in the right tracks?