It sounds like you’re referring to the paper “21+ mph” related to the Indonesian term keju (cheese) — possibly in the context of a physics or engineering study on drag, aerodynamics, or projectile motion (where “21+ mph” might be a speed threshold, and “keju” could be a nickname for an object’s shape, like a wedge/cheese shape).

  1. Buy or borrow a Stalker Pro II radar gun. (The cheaper models max out at 20 mph for dog-sized targets.)
  2. Set up a 40-yard lane with cones marking the catch zone.
  3. Film in 240fps slow-mo. Review the frame where the dog’s nose crosses the disc plane. Count the feet traveled between frames. Calculate velocity.
  4. Realistically, most dogs will hit 17-19 mph. Do not be discouraged. The 21+ mph keju is the top 2% of all disc dogs worldwide.

A typo for “21+ mph kart” (go-karting), with a secondary possibility as a fringe Indonesian extreme cheese-rolling event that reached 21.3 mph before being banned.

(the Indonesian word for cheese) is frequently used as slang for "cheesy" or "sappy" romantic content, while 21+mph+keju

Where to find 21+ mph karting in Indonesia (where “keju” originates):

Pros:

A Futuristic Tale: The Speed of Dreams and the Quest for Keju

In the year 2154, humanity had reached a new zenith of innovation, pushing the boundaries of speed and culinary exploration. Among the many marvels of this era, the invention of the Magnetic Propulsion Hyperlane (MPH) system stood out, allowing vehicles to travel at unprecedented speeds. The fastest of these, the X-1000 model, could easily breach the 21 mph barrier, a feat that was once considered the realm of science fiction.

is a recognized leader in Hawaii's Kahalu’u community garden efforts Cultural Food It sounds like you’re referring to the paper

: NFL quarterback Lamar Jackson has famously noted that his fastest recorded run (21 mph) felt like "jogging". Electric Bicycles