Projectile with air drag (RK4) — a TI-84 Plus CE program

By E-Code · updated 2026-09-26

PROJ is a TI-BASIC program for the TI-84 Plus CE. Fourth-order Runge-Kutta flight with quadratic drag, calling DRAG four times a step; range, height, time and impact speed.

How it's checked

It is checked by E-Code's engineering suite: scripted runs on the TI-BASIC interpreter whose expected numbers were worked out separately in Python. It has no oracle case file, so this page gives no case count.

How E-Code checks every program

Run it or put it on your calculator

• Open the library in the TI-84 Plus CE calculator and pick “Projectile with air drag (RK4)” (PROJ).
• Put it on your own calculator with a computer and a USB cable, or type it in by hand.

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• Oblique central impact
• Block sliding onto a spring
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• Rolling body on an incline

All TI-84 Plus CE physics programs · All TI-84 Plus CE programs