Question

What how mass is not costant and can increase with velocity?

Answer 1

Answer:

As an object increases in speed, so does the amount of energy that it has, this energy is what we refer to as 'the increase in mass' (just remember, this is inertial mass). ... Since an object has infinite kinetic energy when it approaches the speed of light, it therefore has infinite mass as well.

Explanation:

The invariant mass of a particle is independent of its velocity v, whereas relativistic mass increases with velocity and tends to infinity as the velocity approaches the speed of light c. They can be defined as follows,

   mr = E/c2

   m0 = sqrt(E2/c4 - p2/c2)

Where E is energy, p is momentum and c is the speed of light in vacuum. The velocity dependent relation between the two is,

  mr = m0 /sqrt(1 - v2/c2)

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