Hey student pushes a wagon full of bricks with a constant force across the ground which of the following changes were doubled the acceleration of the wagon removing half of the masking bricks from the back of the wagon pulling the wagon over grass and country adding faces many breaks to the back of the wagon reducing the initial force by half

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.