A body A rests on a railway platform while an identical body B is inside a moving train. From the perspective of the ground, which of the following energies of B exceed those of A ?

Step-by-step solution

Body A is at rest on the ground, so its macroscopic velocity v_A = 0 . Body B is in a moving train, so its macroscopic velocity v_B > 0 with respect to the ground. Kinetic energy of A is zero, while kinetic energy of B is 1 2 mv_B^2 > 0 . Thus, the kinetic energy of B exceeds that of A . Mechanical energy is the sum of kinetic and potential energy. Assuming both bodies are at the same reference level, their potential energies are equal. Hence, the mechanical energy of B is greater than that of A . Internal energy d