Aforce of 50 newtons causes a sled to accelerate at a rate of 5 meters per second. what is the mass of the sled. (a) 5 kilograms (b) 10 kilograms (c) 50 kilograms (d) 1 kilogram

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