# Metres per Second per Second

## Key Stage 3

### Meaning

Metres per second per second are the scientific unit of acceleration.

### About Metres per Second per Second

Metres per second per second are shortened to m/s/s with a lower case m, a lower case s and another lower case s.
A metre per second per second means that every second an object is travelling faster by one metre per second.

## Key Stage 4

### Meaning

Metres per second per second are the scientific unit of acceleration.

### About Metres per Second per Second

Metres per second per second are shortened to m/s/s with a lower case m, a lower case s and another lower case s or ms-2 with a lower case m, a lower case s and an indices of -2.
A metre per second per second means that every second an object is travelling faster by one metre per second.

#### Typical Accelerations in m/s/s

You should be able to estimate the acceleration for these events:

 Event Acceleration in m/s/s A falling object 9.8 Start running 3.0 Car accelerating 4.0 Passenger Jet Takeoff 5.0 Fighter Jet Takeoff 60