The displacement of the body between the 2nd and 4th second
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s
4
=2s
2
(4u+
2
a
4
2
)−(3u+
2
a
3
2
)=2{(2u+
2
a
2
2
)−(u+
2
a
}
⇒1.5a=u
⇒u=
2
9
m/s
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