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\[v = u -at\]
\[u = at\]
t - 1 = n
t = n +1
u = a (n+1)

Nw Substitute the Value of u in the 1st equation

\[Dn = an + a - an + a/2 = 3a/2\]

Thank you! (:

Welcome...

why is t-1=n?

secondlast second of its motion

let t be the total time

secondlast = t-1

oh.. haha.. ty again!