A body is thrown vertically upwards with a speed 40m/s. after attaining maximum height, the body returned back to the ground. Draw distance-time and displacement-time graph.

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