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Prove the relation, st=u + at - 1/2 a....

Prove the relation, `s_t=u + at - 1/2 a.`

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The correct Answer is:
A
`S_t=("displacement upto t sencond")`
`-["displacement upto (t-1)sec"]`
`=ut+1/2 at^(2)-[u(t-1)+1/2a(t-1)^2]`
`=u+at-1/2 a`
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