To find the acceleration, we can use the formula: $a = \frac{v_f - v_i}{t}$, where $v_f$ is the final velocity, $v_i$ is the initial velocity, and $t$ is the time taken.
For the first case, $v_f = 10 \,\text{m/s}$, $v_i = 30 \,\text{m/s}$, and $t = 2 \,\text{s}$.
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