Average velocity of a particle moving in a straight line with constant acceleration ‘a’ and initial velocity ‘u’ in first ‘t’ second is

• A

  $\mathrm{u}+\frac{1}{2}\mathrm{at}$

• B

  u + at

• C

  $\frac{\mathrm{u}+\mathrm{at}}{2}$

• D

  $\frac{\mathrm{u}}{2}$