10+ 5+ In an experiment, students roll a cart down an inclined plane of negligible friction. The students determined that the cart's mass is 0.50 kg, and the angle of the inclined plane is 30 above the horizontal. The students use a motion detector to record the acceleration a of the cart as a function of time t. The data are shown in the graph. One student states that the collected data is not valid. Which of the following could be a valid explanation for the flawed data? A There is friction acting on the cart, reducing the acceleration from what was expected. B The incline is at an angle greater than 30 , increasing the acceleration from what was expected. C The cart has a mass greater than 0.5 kg, increasing the acceleration from what was expected. D The surface of the inclined track is not uniform, creating fluctuations in the acceleration as seen with the bumpy line. E The student is incorrect. The data shown are accurate for the information given. <