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Well, if he doesn't slow down, then he'll hit the Earth at 86,000 mph. So, $$KE = \frac {mv^2}{2}$$ $$KE = \frac {158.3 kg\times (38445 m/s)^2}{2}$$ $$KE = 1.17\times 10^{11} N$$ I have no idea how to calculate the size of the carter it creates.
If you consider it hopeless to memorize physical constants, it will probably help to find combinations of these constant that relate to the human scale. For instance: The gravitational constant $G$ might be difficult to memorize. This holds for both the units as well as the value. However, multiply this constant by the density of water, take the square ...