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The x and y coordiates of a particle at ...

The x and y coordiates of a particle at any time t are given by x = 7t + `14 t^(2)` and y = 5t, where x and y are in metre and t is in second. The acceleration of the particle at t = 5 s is

A

zero

B

28 m`cdot s^(-2)`

C

20 m`cdot s^(-2)`

D

40 m`cdot s^(-2)`

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