A dog runs 5m north, then 3m south ,then 20 m east, then 6m west then 2m north, then 4m north, then 6m east, 10m south, then 2m west, then 4m north
a. What distance did the dog travel?
b. What is his displacement from his starting place?

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system