This applet allows you to explore the trajectory in space of a ball thrown in the {x,y}[br]plane, as well as the x and y positions of the ball as functions of time.[br]When you insert a wall at a suitable chosen position along the x axis, the ball[br]is reflected back to the person who threw the ball. If you do that...[br][br]does the trajectory in space change?,[br][br]does x(t) change?,[br] [br]does y(t) change? [br][br]Where does the wall have to be placed?[br][br][color=#c51414][i][b]Right click and hold to 'tumble' the 3D view.[br][/b][/i][/color]

The wall is shown as a plane perpendicular to the {x,t} plane [br]and parallel to the {y,t} plane. Can you explain why the wall is[br]depicted this way?