Answer: E = Fd = (ma)d = mgd = (1 kg)(9.8m/s2)(1 m) = 9.8 kg m/s2 = 9.8 joules.
Explanation: A joule is the amount of energy needed to exert a force of one newton through one meter. For example, if you lift a one-kilogram weight one meter, then the energy you must expend