4. A particle P passes through point A with velocity 2.8 ms and
constant acceleration 0.12 m s².
Three seconds later a second particle Q passes through A with
velocity 2.4 ms and constant acceleration 0.2 m s².
a Write down expressions for the displacements of P and Q from A,
in terms of t, where ts is the time after P passed through A,
b Show that, when the particles meet, 2²-501-315=0
e Find the distance from A when the two particles meet.