Sally and Juan's science teacher challenged her students to build a paper airplane that would stay airborne for ninety seconds. The students have two days to design and test their planes. The assignment will end with a "fly-off."

First, Sally and Juan researched plane designs. Then they built their first plane. Each time they tested the plane, it took a nose dive straight into the floor. They changed the design by reshaping the nose of the plane and adding some weight to the tail. The plane flew, but did not get very far. After a few tries, their plane stayed in the air an average of twenty-two seconds.

Predict the outcome of succeeding trials if Sally and Juan had changed their throwing technique.