3. When you threw the ball upward at 40 m/s, how much time would have passed from when you threw it to when you catch it? *
2 seconds
4 seconds
8 seconds
12 seconds

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