(Solved): please help with a-b thank you :) About 50,000 years ago, a meteor crashed into the earth near pres ...

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 $$1.4\times 10^8\mathrm{kg}$$ (around 150,000 tons) and hit the ground at a speed of $$12\mathrm{km}/\mathrm{s}$$. For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Using work and energy to calculate speed. How much kinetic energy did this meteor deliver to the ground? Express your answer with the appropriate units. How does this energy compare to the energy released by a $$1.0$$ megaton nuclear bomb? (A megaton bomb releases the same energy as a million) tons of TNT, and 10 ton of TNT releases $$4.184\times 10^9\mathrm{J}$$ of energy.) Express your answer using two significant figures.