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The distance travelled by a body in the ...

The distance travelled by a body in the nth second is given by the expression (4+ 6n). Find the initial velocity and acceleration.

A

`3ms^-1,6ms^-2`

B

`7ms^-1,4ms^-2`

C

`7ms^-1,6ms^-2`

D

`7ms^-1,4ms^2`

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