Complex sentence: For example, the students are sometimes asked to find the optimal water/Alka-Seltzer ratio to propel the canister the greatest distance, or they may derive equations to calculate the speed and velocity of the rocket from the distance it travels.
Split into simpler sentences: For example, the students are sometimes asked to experiment with the amounts of water and Alka-Seltzer to find the combination which propels the rocket the greatest distance. Alternatively they may derive equations to calculate the speed and velocity of the rocket from the distance it travels.