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Q.

The x and y coordinates of the particle at any time are $x = 5 t - 2 t^{2}$ and y = 10t respectively, where x and y are in meters and t in seconds. The acceleration of the particle at t = 2s is :

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a

$- 4 m / s^{2}$

b

$0$

c

$- 8 m / s^{2}$

d

$5 m / s^{2}$

answer is D.

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Detailed Solution

$v_{x} = 5 - 4 t$
$a_{x} = 0 - 4$

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