Explain each of the following questions:

7. An object with an unknown initial velocity has a constant acceleration with components ax = 8 m/s2 and ay= 0. Which of the following is a possible expression for the position of this object, in meters, for both the x and y directions as functions of time? A. x = 8tandy = 0 B. x = 8t and y = 8t C. x = 8t2 and y = 8tz V D. x = 4t2 and y =8t E. x = 4t2 and y = 4t2 8. A particle is moving along the y-axis. The particle's position as a function of time is given by y = at"- Bt + , where a = 1 m/s', B = 4m/s, and = 3 m. What is the particle's acceleration at time t = 3.0 s? A. 6.0 m/s B. 9.0 m/s2 C. 15.0 m/s2 V D. 18.0 m/s E. 27.0 m/s9. An object of mass 10 kg starts from rest at time t = 0 and moves in a straight line. For time t > 0, the object's velocity v as a function of time t is given by v = 2t + 3t- , where v is in m/s and t is in seconds. How far does the object travel during the first 10 s of its motion? A. 62 m B. 320 m C. 383 m V D. 1100 m E. 1600 m10. The position of an object is given by the equation x = 3.0t