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Kinetic energy is the energy contained in an object because of its relative velocity to an...

Kinetic energy is the energy contained in an object because of its relative velocity to an observer. It is calculated quite easily as: E = 12 m v 2
where m is the mass (in kg); v is speed (in m/s) and E is the energy (in joules).

What is the energy of impact of a comet made of ice (density is 1000 kg/m3) if it has a radius of 1 km and strikes the Earth at 30 km/s. Give your answer in megatons of TNT (million of tons of TNT). One megaton of TNT has an energy equal to 4 x 1015 joules

HINT: Remember to make sure your units are in kilograms, metres, and seconds
43 × ? × r 3 HINT: mass = density multiplied by volume. For a spherical object, the volume is
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