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Load the ProMotion or ProMotion applet, and enter data off your Data Table into the applet.

ProMotion screen shot

The 'Launch X' field should be left as 0. Enter your finding for Y1 into the 'Launch Y' field. In the 'Land X' and 'Land Y' fields, enter X1 & Y2 values respectively. Then fill in your ΔY, ΔX values into the 'Launch dX' and 'Launch dY' fields.

Make sure that 'Type' is set to 'Point-Point-Slope' (the default) and that units are in cm, then click 'New Graph'. You may need to zoom in or out X or Y a bit to see the full curve computed, but the important thing to see is the calculated velocity, labeled 'Initial Velocity' in the lower-left portion of the applet. Write this number down on your Data Table, next to the X1 entry that you used in ProMotion or JavaScript ProMotion.

Repeat these steps for each of the X1 entries you have recorded.

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