Moriastera

We know the power (6x10^4 Watts), and that power equals work over time. If you solve for the work, you get 1.2x10^5 Joules. Work is a form of energy, and if you set the initial kenetic energy (0 joules) plus the work done by the engine equal to the final...

Conservation of momentum. The ramp will move back with equal but opposite momentum from the block. In any case, even a fixed ramp, momentum is conserved but it becomes a much larger system, the earth ramp block system.