The x and y coordinates of the particle at any time are x = 5t - 2...

$\begin{cases}x = 5t - 2{t}^{2} & y = 10t\end{cases}$

$\begin{cases}\dfrac{dx}{dt} = 5 - 4t & \dfrac{dy}{dt} = 10\end{cases}$

The velocity of the particle in $x$ and $y$ coordinate is

$\begin{cases}{v}_{x} = 5 - 4t & {v}_{y}\end{cases} = 10$

$\dfrac{d{v}_{x}}{dt} = - 4$ $\dfrac{d{v}_{y}}{dt} = 10$

$\begin{cases}{a}_{x} = - 4 & {a}_{y} = 0\end{cases}$

Acceleration of particle at $t = 2s$ is $= - 4m / {s}^{2}$