A car starts with velocity $u$. It then travels in a straight line with constant acceleration $a$ over a displacement $d$. The car ends with final velocity $v$. Which expression gives the initial velocity $u$ of the car?
- A$v-ad$
- B$\sqrt{v^{2}-2ad}$
- C$v+ad$
- D$v-\frac{1}{2}ad^{2}$