In the equation vx^2=v0x^2+2ax(x-x0) what does the terms vx, v0x, x, and x0 stand for respectively? a. velocity at position x, velocity at time t=0, position at time t=0 b. velocity at position x, velocity at position x=0, position x, and the original position c. original velocity, velocity at position x=0, position x, and the original position d. original velocity, zero velocity, original position, and the zero position