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- Calculate the kinetic energy of a Boeing 767 that is 350,000lbm and travels at 400mph. Would I use the kinectic enrgy formula? Or the translation formula since it's in english units?I want to measure the kinetic energy of a ball travelling down a feild. If the mass of the ball is halved, what is the effect on the kinetic energy of the ball?In considering the energy supply for an automobile, the energy per unit mass of the energy source is an important parameter. The "heat of combustion" or stored energy per mass is quite similar for gasoline, ethanol, diesel fuel, cooking oil, methane, and propane. For a broader perspective, compare the energy per mass in joules per kilogram for gasoline, lead-acid batteries, hydrogen, and hay by stating the factor of increase between each one and the next. Hydrogen has "heat of combustion" 142 MJ/kg. For wood, hay, and dry vegetable matter in general, this parameter is 17 MJ/kg. A fully charged 17.0 kg lead-acid battery can deliver power 1450 W for 1.0 hr. (For comparison, the "heat of combustion" of gasoline is about 44 MJ/kg.) battery MJ/kg hay ✕ larger than battery energy/mass gasoline ✕ larger than hay energy/mass hydrogen ✕ larger than gasoline energy/mass