a	=	Δv/Δt
	=	((d1/t1) − (d2/t2)) / (t1 − t2)
	=	(d3/t3) / t4
	=	d3 / (t3 × t4)
where:
a	=	acceleration
Δ	=	difference
v	=	Velocity
d	=	distance
t	=	time