I am going to put the maths down here for everyone to use, it's very simple.
s = ut + (1/2)a(t^2)
where:
s = displacement (ie 400m)
u = initial velocity ie (0m/s)
t = time (in seconds)
a = accelaration (m/s/s)
(1/2) = half
(^2) = to the power of 2
the other equation to work out your accelaration from your time to 100 is:
v = u + at
where:
v = velocity (in m/s)
a = acceleration (in m/s/s)
and the others have the same meaning as above.
so initially you use the second equation to work out your accelaration in m/s/s, and then you plug that into the first equation to calculate time to displace 400m.
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