Question

A comet with a mass of 7.85 × 1011 kg is moving with a velocity of 25,000 m/s. calculate its kinetic energy.

Answer 1

The kinetic energy of an object is given by:

`K= (1)/(2)mv^2`
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
`m=7.85 \cdot 10^(11) kg` and a velocity of
`v=25000 m/s`, so its kinetic energy is:

`K= (1)/(2)(7.85 \cdot 10^(11) kg)(25000 m/s)^2=2.45 \cdot 10^(20)J`