When useDamping
is false (the default), this is absolute loss of velocity due to movement, in pixels per second squared.
When useDamping
is true, this is a damping multiplier between 0 and 1.
A value of 0 means the Body stops instantly.
A value of 0.01 mean the Body loses 99% of its velocity per second.
A value of 0.1 means the Body loses 90% of its velocity per second.
A value of 1 means the Body loses no velocity.
The x and y components are applied separately.
Drag is applied only when acceleration
is zero.