(Solved): 5. (20 points) About 50,000 years ago, a meteor crashed into the earth near p ...

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5. (20 points) About 50,000 years ago, a meteor crashed into the earth near present-day Flagstaff, Arizona. Measurements from 2005 estimate that this meteor had a mass of about $1.5\ast 10^8\mathrm{kg}$ (around 150,000 tons) and hit the ground at a speed of $13\mathrm{km}/\mathrm{s}$. (a) How much kinetic energy did this meteor deliver to the ground? (b) How does this energy compare to the energy released by a 1.0megaton nuclear bomb? (A megaton bomb releases the same amount of energy as a million tons of TNT, and 1.0 ton of TNT releases $4.184\ast 10^9\mathrm{J}$ of energy.)