This model applies for a point particle subject to a constant acceleration that is either parallel to or antiparallel to the particle's initial velocity.
It is a subclass of the One-Dimensional Motion (General) model defined by the constraint da/dt = 0.
Model Specification
System Schema
Internal Constituents: None. Object must be treated as a point particle.
External Agents: Some constant external influence must be present which produces the acceleration.
Descriptors
Object Variables: None.
State Variables: Time (t), position 
and velocity (v) are possible state variables. Note that in some cases only two of the three possible state variables will be needed.
Interaction Variables: Acceleration (a).
Laws of Interaction
Acceleration must be a constant.
Laws of Change
(v_
- v_
Unknown macro: {rm i}= a (t_
- t_
) )
( x_
= x_
+ \frac
(v_
+ v_
)(t_
- t_
) )
( x_
= x_
+ v_
(t_
- t_
) + \frac
a (t_
-t_
)^
)
(v_
^
= v_
^
+ 2 a (x_
- x_
)