In space exploration missions, ion propulsion engine is an efficient way of travelling. The first such engine was used in Deep Space 1 spacecraft. It produced a constant acceleration.
Given below are approximate velocities of the engine.
The initial average velocity of the engine in its first month was 27360 km/hour. When the spacecrafts passed the asteroid, Braille, it reached an average velocity of 55800 km/hour.
Based on the first 6 months of Deep Space 1's monthly average velocity, the following table was created.