Here's a fun group project for differential calculus students.
Students go on a drive, record speed and distance, and then analyze their data.
Development Site for Complex, Technology-Based Problems in Calculus with Applications in Science and Engineering. Go on a 20 minute drive in which you cover various speeds. Each person should have at least one task. The other person or persons should concentrate on reading the odometer and speedometer, and record the data. For three person teams, make one person the observer, and the other the recorder.