As the block continues forever, energy is conserved.
From the law of conservation of energy, the initial mechanical energy at the top of the inclined track, E equals the final mechanical energy at the bottom of the inclined track, E'.
E = E'
U + K = U' + K' where U = initial potential energy, K = initial kinetic energy, U' = final potential energy = 0 J (since it is on level ground) and K' = final kinetic energy.
So, U + K = U' + K'
U + K = 0 + K'
U + K = K'
We observed that the total final mechanical energy is kinetic.
Since the block continues on the infinite flat surface forever, there are no frictional forces acting on it.
And according to Newton's first law of motion, which states that a body will continue in its state of uniform motion or rest unless a force acts upon it to change its state of uniform motion or rest, the block will continue in its motion since no other forces act on it.
Since, the total final mechanical energy is kinetic, energy is conserved.
So, as the block continues forever, energy is conserved.
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