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The x and y coordinates of the particle ...

 The x and y coordinates of the particle at any time are `x=5t-2t^(2)` and y = 10t respectively, where x andy are in metres and / in seconds. The acceleration of the particle at t = 5 s is

A

`5 ms^(-2)`

B

`- 4 ms^(-2)`

C

`- 8 ms^(-2)`

D

0

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