Unless otherwise posted, what is the speed limit for cars in a residential area?_
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The kinetic energy of an object is given by:
where
K is the kinetic energy
m is the mass of the object
v is its velocity.
The comet in our problem has a mass of
and a velocity of 
, so its kinetic energy is:
where
K is the kinetic energy
m is the mass of the object
v is its velocity.
The comet in our problem has a mass of