Question

A car start from rest at a check point A and comes to rest at the next check point B 6 away in 3m it has a uniform acceleration for 30s then a constant speed and brought to rest with a uniform retardiation 20s
and the question is ... ?
recall that
s = 1/2 at^2
v = at

and what does "checkpoint B 6 away in 3m" mean?

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