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 that relates acceleration (a) to change in velocity (Δv) and time taken (t) is given by:

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

where

• ( \Delta v = v_f - v_i ) (final velocity minus initial velocity)
• t is the time taken for this change.

To calculate the acceleration of the van, we first determine the change in velocity:

(\Delta v = v_f - v_i = 20 , \text{m/s} - 2 , \text{m/s} = 18 , \text{m/s})

Next, we apply the formula for acceleration:

$a = \frac{\Delta v}{t} = \frac{18 \, \text{m/s}}{12 \, \text{s}} = 1.5 \, \text{m/s}^2$

Thus, the acceleration of the van is ( 1.5 , \text{m/s}^2 ).