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To convert km/h to m/s, divide by 3.6. So 72 km/h = 20 m/s, 108 km/h = 30 m/s, and 360 km/h = 100 m/s. Dividing by 3.6 is exact — it comes from converting hours to seconds (÷3,600) and kilometers to meters (×1,000), giving a net factor of ×1,000÷3,600 = ÷3.6.
Scientific calculations almost always require m/s, not km/h. Kinetic energy (½mv²), drag force, Reynolds numbers, and projectile motion equations all use SI units — meters and seconds. A 90 km/h car must be expressed as 25 m/s to compute braking distance or air resistance in a physics formula.
Did you know? The speed of light in a vacuum is exactly 299,792,458 m/s — or 1,079,252,848.8 km/h (about 1.08 billion km/h). This is by definition the fastest speed at which information can travel in the universe, according to special relativity.
Physics and engineering equations — kinetic energy, drag, fluid dynamics — require m/s. Wind tunnel testing converts airspeed from km/h to m/s for aerodynamic calculations. Robotics and autonomous vehicle algorithms work in m/s internally, even when user interfaces display km/h. Sports science analyzing athlete velocity for biomechanical modelling uses m/s.