Question

You are cruising at a constant speed of 100 km/hr on a highway with a speed limit of 60 km/hr. A police officer stationed in the area sees you and started his pursuit to catch you just as the time you pass his position. He immediately starts from rest and accelerates at a constant 2.5 m/s

Answer 1

$s=vt$ and $s=at^2/2\to vt=at^2/2\to t=2v/a=2\cdot27.8/2.5=22.24\ (s)$ . Answer