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A spaceship of mass \( m \), flies through space with a velocity \( v \). Once a body has velocity and mass, it also has kinetic energy \( W_{\text{kin}} \), which can be calculated as follows:$$ W_{\text{kin}} ~=~ \frac{1}{2} \, m \, v^2 $$
This is a formula for the classical kinetic energy, which means: The formula is valid only for velocities significantly below the speed of light.