Suppose a car accelerates constantly from rest. The work done is W=Fd, so the net force times the distance traveled is ________. ma * (1/2 * a * t²) = m * (Δv/t) * (1/2) * (Δv/t) * t² = 1/2 * mv² (final velocity). Is this energy the car has, gained from its whole trajectory or is this the energy it has while it is moving with its final velocity? And what if it is not accelerating from rest, but from a certain velocity to a final velocity, should the v squared in the formula be the difference between the initial and final velocity?