# What is the fastest speed in the world?

### What is the fastest speed in the world?

The current absolute world record holder speed earthly is ThrustSSC, a twin-turbojet car that reached 763,035 mph – or 1,227.985 km/h – over one mile in October 1977. This is the first supersonic record since the vehicle crossed the sound barrier at Mach 1.016.

### What is speed?

Speed ​​is a dimensionless quantity. Rapidity is rarely used in calculations because it is less practical than four velocity in momentum invariance formulas. In addition, it requires choosing a frame of reference that isolates the velocity vector or the difference in velocities on a single axis.

### What’s the point of speed?

The interest of rapidity comes from the fact that, due to its linear character, it preserves the relation of classical mechanics between speed and acceleration (a traveler can therefore calculate his rapidity by integrating in time, a measurement provided by an accelerometer) .

### What is the difference between rapidity and quadrate?

Rapidity is rarely used in calculations because it is less practical than four velocity in momentum invariance formulas. In addition, it requires choosing a frame of reference that isolates the velocity vector or the difference in velocities on a single axis.

### What is the fastest sprint in the world?

The fastest man and woman in the world The world records for running over 1 meter – the main sprint distances in athletics – are held by Jamaican Usain Bolt.