Assume that a common flea can jump straight up to a maximum height of 20 cm. If the flea has mass m = 0.5 milligrams, calculate the potential energy of the flea (in Joules, J) once it reaches its maximum height.  If the flea in jumps to its maximum height but misses jumping onto a 4-legged friend, then obviously, the flea will fall to the ground. Calculate the force of gravity acting on the flea, during its free-fall to the ground? Assume that the flea falls straight down from its maximum jump height. Express the answer in Newtons.

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