# What is the unit of acceleration and momentum?

The S.I. unit of acceleration is meter per second square or ms−2, and momentum is kg · m/s.

### Momentum and acceleration

• Acceleration can be defined as the rate of change of velocity with time. It can also be defined as the increase in velocity per second. The S.I. unit of acceleration is meter per second square or ms−2.
• Linear momentum is defined as the product of a system’s mass multiplied by its velocity: p = mv.
• The SI unit for momentum is kg · m/s.
• There are two kinds of momentum, linear and angular. A spinning object has angular momentum; an object travelling with a velocity has linear momentum.
• The average acceleration over a period of time is defined as the total change in velocity in the given interval divided by the total time taken for the change.