What is acceleration?Acceleration is the rate of change of the velocity of an object with respect to time. It is therefore a vector quantity, just like velocity. Meaning that it includes both a magnitude (size) and a direction. Conversion Samples1 km/s² = 1000 m/s²1 yd/s² = 3 ft/s²1 ft/s² = 12 in/s²1 Gal = 0.01 m/s²1 mi/s² = 1760 yd/s²1 g₀ = 9.80665 m/s²