The kinetic energy of the girl is 120 J while the dog has 40 J.
if the dog speeds up, it would have a kinetic energy of 160J.
In order to get these answers, you need to use the formua for kinetic energy which is KE=1/2 mv^2. mass=m, v=velocity and KE= Kinetic Energy.
Answers of tthe questions are reasonable because you would gain more energ if you run faster and also more energy if you gain more mass.