e=mc^2?

e/c^2 = m

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m = E/c^2

Units

Units of 'E' are kg m^2 s^-2

or

kg(m/s)^2

or

kg m^2 / s^2

or

kg m ( m/s^2)

In words it is a mass(kg) multiplied to distance (m) multiplied to acceleration (ms^-2).

When Basic S.I. units are arranged in this manner they are referred to a Joules.

Since Kinetic Energy is defined as E = (1/2) * m * V ^^2

E(60kms) = (1/2) * m * 60^^2 = (1/2) * m * 3600

E(30kms) = (1/2) * m * 30^^2 = (1/2) * m * 900

E(60kms)/E(30kms) = 3600/900 = 4

Answer is 4 times as much.