A car is travelling along a straight horizontal road with initial velocity $u$ ms$^{-1}$ - AQA - A-Level Maths Pure - Question 12 - 2022 - Paper 2

To find acceleration, we can use the first equation of motion:

$v = u + at$

Where:

• $v$ is the final velocity ($4u$ ms$^{-1}$)
• $u$ is the initial velocity ($u$ ms$^{-1}$)
• $a$ is the acceleration (what we need to find)
• $t$ is the time (5 seconds)

Substituting the known values into the equation leads to:

$4u = u + a \cdot 5$