Question

I have two Points in 2D

//Point1 has velocity 
vX = 100;
vY = 50;
posX = 300;
posY = 100;


//Point2  has velocity 
vX = -20;
vY = 80;
posX = -800;
posY = 1000;

Additional I have a point which is placed directly in the middle of these two points, how can i calculate speed of this middle point ?

Answer 1

By determining what it’s vX and vY are.

Its x and y are

x = (-800 - 20 * t + 300 + 100 * t) / 2
y = (1000 + 80 * t + 100 + 50 * t) / 2

Simplify

x = -250 + 40 * t
y = 550 + 65 * t

so it’s vX is 40 and its vy is 65. My friend Pythagoras tells me the speed here is sqrt((40 * 40) + (65 * 65)) or roughly 76 units per tick.