friction and terminal velocity of a parachutist vs a car

[SEE]

Raaid, "conservation of Energy' laws apply - E=1/2MVsquared, Potential energy, kinetic energy, etc, all apply. That block will lose energy for a whole bunch of reasons as it slides down (useful energy being converted into other and unwanted energy forms) but at any point the energy sum must always be equal to the starting energy before you dropped it onto the ramp.