That's a metric unit for acceleration.
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The SI unit of measurement for weight is the newton.
In the SI measurement system, a meter is a "base unit". However, the definition relies on the prior definition of the second.
'ms-2' is the SI derived unit of acceleration. It means that a speed X is changing by 1ms-1 for every second of its acceleration.
Hertz (Hz) is the SI unit of frequency, equal to one cycle per second.
A second is a SI base unit.