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The velocity components of blue curve are [color=blue]Vx,Vy[/color] , the velocity components of red curve are [color=red]Vx,Vy[/color].
What is the relation between [color=blue]Vx,Vy[/color] and [color=red]Vx,Vy[/color]

(A) Vx= 2Vx, Vy=2Vy
(B) Vx=Vx, Vy=2Vy
(C) Vx=?2 Vx, Vy= ?2 Vy
(D) Vx=Vx, Vy=?2 Vy

After you have your answer ready, Click the mouse inside the applet region and hit "h" key to see how the curve were set up. You can modified the equations for any motion you want to study. Just enter your forumla into the textfield. (hit "h" will toggle the display mode) Enjoy it! :)