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The x and y co-ordinates of a particle a...

The x and y co-ordinates of a particle at any time t are given as `x=2t^(2)+14` and `y=1.5t-7`.The acceleration of particle at `t=7` second is
(1) 5m/`s^(2)`
(2) 4m/`s^(2)`
(3) 0m/`s^2`
(4) 3m/`s^(2)`

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