In this question you must show detailed reasoning.
A student films a tennis ball dropped from rest through a vertical distance of 1.80 m. The measured time is 0.64 s. The student first models the ball as a particle moving freely under gravity with g=9.8 m s−2g=9.8\text{ m s}^{-2}g=9.8 m s−2.
Use the model to calculate the predicted time of fall.
Compare the prediction with the measured time.
Give two possible reasons for the difference.
Describe one practical refinement to the investigation that would help decide whether air resistance is significant.