Step 1: Understand that acceleration is the gradient of a speed-time graph.

c)

(i) Step 1: Understand that acceleration is the gradient of a speed-time graph.
The formula for acceleration is:

$$a = \frac{\Delta v}{\Delta t} = \frac{v_2 - v_1}{t_2 - t_1}$$

Step 2: Read the speeds from the graph at the given times.
At $t_1 = 0$ s, $v_1 = 0$ m/s.
At $t_2 = 0.25$ s, read the speed from the graph. Each small square on the time axis is 0.05 s. So 0.25 s is 5 small squares from 0. Each small square