7. According to a seated woman, a 67.7-kg man runs with his 32.4-kg dog toward a 20.2- kg child who is running toward the man. The man and dog's speed is 3.50 km/h, and the child's speed is 1.25 km/h. 1. According to the woman, what is the kinetic energy of the man-dog-child system? ( Ans: 48.5 J ) 2. According to the man, what is the kinetic energy of the man-dog-child system? ( Ans: 17.6 J )

7. According to a seated woman, a 67.7-kg man runs with his 32.4-kg dog toward a 20.2- kg child who is running toward the man. The man and dog's speed is 3.50 km/h, and the child's speed is 1.25 km/h. 1. According to the woman, what is the kinetic energy of the man-dog-child system? ( Ans: 48.5 J ) 2. According to the man, what is the kinetic energy of the man-dog-child system? ( Ans: 17.6 J )