Question

John is approaching a stoplight moving with an initial velocity of 30.0 m/s. The light turns yellow, and
John applies the brakes and skids to a stop. If John’s decelerates in a rate of 8.00 m/s^2, then
determine the displacement of the car during the process.

Answer 1

$v { }^{2} - {u}^{2} = 2as$
where
u= 30
v=0
a= -8
${ 30}^{2} - {0}^{2} = 2 \times ( - 8) \times s$
$- 900 = - 16s \\ s = 900 \div 16 \\ s = 56.25m$