Speedroo

How fast does a crack race through glass?

3,355 mphAbout 5,400 km/h · Jet

Up to about 3,400 mph (1,500 m/s), which is why a window seems to shatter all at once.

That's about 96 times a red kangaroo's top speed of about 35 mph (56 km/h).

3,355 mph
a dragster

By speed: a crack in glass is about 10× faster than a dragster.

Think you can guess? Play today's Speedroo

Things about as fast

Many real things vary, so we use a typical or official figure. Spotted a mistake? Email [email protected].