The position of an object moving along the $x$-axis is given by $x = a + b t^{2}$,where $a = 8.5 \; m$,$b = 2.5 \; m s^{-2}$,and $t$ is measured in seconds. What is the velocity at $t = 0 \; s$ and $t = 2.0 \; s$?
- A$10 \; m s^{-1}, 20 \; m s^{-1}$
- B$0 \; m s^{-1}, 20 \; m s^{-1}$
- C$0 \; m s^{-1}, 10 \; m s^{-1}$
- D$0 \; m s^{-1}, 0 \; m s^{-1}$
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