The only force acting on a 2 kg body as it moves along a positive x-axis has an x component Fx = - 6x N , with x in meters. The velocity at x = 3 m is 8 m/s. (a) What is the velocity of the body at x = 4 m? (b) At what positive value of x will the body have a velocity of 5 m/s?

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