(adsbygoogle = window.adsbygoogle || []).push({}); 1. An asteroid of 1.0 km diameter will make a crater of about 10 km diameter. How much kinetic energy does the asteroid have if it strikes the surface at about 20km/s. Convert answers to megatons of TNT; 1 megaton = 4 X 10^15 Joules.

2. I do not understand how there is enough information given to solve this problem. I know that KE= (1/2) mv^2 but I do not know the mass. So I tried to find the mass of a circle, but then you need density, which I also do not have. I am completely lost.

3. Any suggestions would be helpful! Thank you

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Impact energy

**Physics Forums | Science Articles, Homework Help, Discussion**