Question 1

What are common speed units?

Accepted Answer

km/h (metric countries), mph (US/UK), m/s (science), knots (aviation/maritime), Mach (supersonic).

Question 2

How do I convert between speed units?

Accepted Answer

Key factors: 1 km/h = 0.621 mph = 0.278 m/s = 0.54 knots. Memorize a few key conversions.

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.

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