Answer: 12.5m
Step-by-step explanation:
The maximum height the child can reach will be determined by the initial kinetic energy of the child, which is given by KE = 1/2 mv^2. Since the child is running, we can assume that its initial velocity is around 5 m/s. Therefore, the maximum height the child can reach is given by:
Height = (1/2)*(40 kg)*(5 m/s)^2 / (9.8 m/s^2)
Height = 12.5 m
Therefore, the maximum height the child can reach is 12.5 m.