Three students derive the following equations in which x refers to distance traveled, v the speed, a the acceleration (m/s2), t the time, and the subscript zero (0) means a quantity at time t = 0: (a) x = vt + 2at (b) x = v0t + 1/2 at2 (c) x = v0t + 2at2 Which of these could possibly be correct according to a dimensional check? 
a) a 
b) b 
c) c 
d) None of the above