Which of the following statements are true? a. matter is held together by forces. b. thinking is a type of force. c. matter only moves if a force pushes or pulls it. d. forces do not have any effect on matter. (could be more than 1)

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.