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Calculate Slide on a Slope
The acceleration is calculated as the gravitational acceleration (9.81 m/s²) multiplied by the sine of the angle of inclination.
Example: in ski jumping, where friction and air resistance are kept as low as possible during the run-down, a theoretical maximum speed of almost 128 km/h can be achieved with a slope angle of 40° and a length of 100 meters. Speeds actually achieved are around 90 km/h.
Physics commonly uses SI units. Here is a calculator to convert units.