An intriguing challenge with physics

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ShadowTurtle

SetBuffer BackBuffer()
mx# = MouseX()
my# = MouseY()
px# = mx + 100
py# = my 
l# = 40.0
Angle# = 180
Repeat
	Cls
	mx# = MouseX()
	my# = MouseY()
	d# = Sqr((mx-px)^2 + (my-py)^2)
	dx# = ((mx-px)/d)*l+Sin(Angle)*3
	dy# = ((my-py)/d)*l+Cos(Angle)*3
	px# = mx - dx
	py# = my - dy
	Line mx,my,px,py
	Flip
Until KeyHit(1)

hm? :\