1. The problem statement, all variables and given/known data People can run much faster than they can walk. Why is it so? Estimate the maximal walking speed for a man, height 175 cm, and for a 7 years old child, height 120 cm. (A hint: In the first approximation, the legs of a walking person do not bend, and their length is about half of his height.) Estimate how fast you would be able to walk at the Moon, where gravity force is 6 times weaker. 3. The attempt at a solution When I first read this question, it seemed trivial but I don't see how I can estimate a maximal walking speed. It obviously depends on the rate at which the person steps but as you increase the rate, you end up running...so I'm not sure what this question is getting at. Help please!