I am 6'1 and I used a styrofoam block to prevent an egg from cracking. I dropped it at the top of my head and I need to know what the intial momentum, final momentum, and change in momentum is. Can anyone please help?

What occurs during a combustion reaction

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost