Question 1

What is Mach 1?

Accepted Answer

Mach 1 is the speed of sound: 1,235 kph at sea level (varies with altitude/temperature). Mach 2 = twice the speed of sound.

Question 2

How fast is Mach 2?

Accepted Answer

About 2,470 kph or 1,535 mph at sea level. Concorde cruised at Mach 2.04. Fighter jets reach Mach 2+.

Question 3

What's the fastest speed possible?

Accepted Answer

The speed of light (299,792,458 m/s or about 670 million mph) is the universal speed limit. Nothing with mass can reach it.

Question 4

Why do pilots and sailors use knots?

Accepted Answer

One knot = one nautical mile per hour. Nautical miles relate directly to Earth's latitude (1 nm = 1 minute of latitude), simplifying navigation.

Mach to KPH Speed Converter - Free Online Tool

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