Trajectory of free fall with different initial speed

This is a simulation for three particles with different initial velocity ( $vy_1=v, vy_2=0,vy3=-v$ ) under the same gravity $g=10m/s^2$

You can drag the initial position of particles as well as initial velovity (drag the tip of velocity arrow--red )

The number of frames per second can be adjust with slider. (initial value is fps=5, fps=200 is real time case)

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Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License

Please feel free to post your ideas about how to use the simulation for better teaching and learning.
Post questions to be asked to help students to think, to explore.
Upload worksheets as attached files to share with more users.

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