help me with inertia !!!

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hub

Hi !
For my classic vertical shoot'em up, how to add some inertia to... my ship ???
Thanks !

Graphics 800,600


Global Player_x# = GraphicsWidth() / 2
Global Player_y# = GraphicsHeight() / 2

While Not KeyDown(KEY_ESCAPE)

	If KeyDown(KEY_LEFT) Then 
		Player_x# = Player_x# - 1.0
	End If

	If KeyDown(KEY_RIGHT) Then 
		Player_x# = Player_x# + 1.0
	End If

	If KeyDown(KEY_UP) Then 
		Player_y# = Player_y# - 1.0
	End If
	
	If KeyDown(KEY_DOWN) Then 
		Player_y# = Player_y# + 1.0
	End If
	
	Cls
                ' my ship ;-)
	DrawOval Player_x#, Player_y#, 10,10
	Flip
	
Wend