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

The x and y coordinates of a particle at any time t are given by `x=7t+4t^2` and `y=5t`, where x and t is seconds. The acceleration of particle at `t=5`s is

A

zero

B

`8ms^(-2)`

C

`20ms^(-2)`

D

`40ms^(-2)`

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The correct Answer is:

B

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