Fleas have remarkable jumping ability. a 0.55 mg flea, jumping straight up, would reach a height of 30 cm if there were no air resistance. in reality, air resistance limits the height to 20 cm .
part a : what is the flea's kinetic energy as it leaves the ground? express your answer to two significant figures and include the appropriate units.
part b: at its highest point, what fraction of the initial kinetic energy has been converted to potential energy? express your answer using two significant figures.

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest

If element x has 99 protons how many electrons does it have

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)