2 (a) Which of these is a vector? A energy B force C mass D work (b) (i) State the equation that relates acceleration to change in velocity and time taken - Edexcel - GCSE Physics Combined Science - Question 2 - 2020 - Paper 1

The equation for acceleration (a) is given by:

$a = \frac{\Delta v}{t}$

where (\Delta v) is the change in velocity and (t) is the time taken.

To calculate the acceleration of the van, we can apply the equation:

1. Determine the change in velocity:

   • Initial velocity (u) = 2 m/s
   • Final velocity (v) = 20 m/s
   • Change in velocity ((\Delta v)) = v - u = 20 m/s - 2 m/s = 18 m/s

2. Time taken (t) = 12 s

3. Substitute into the acceleration formula: $a = \frac{\Delta v}{t} = \frac{18 \text{ m/s}}{12 \text{ s}} = 1.5 \text{ m/s}^2$

Thus, the acceleration of the van is 1.5 m/s².