A car travels on a straight horizontal road, speeding up at $5.0\,\text{m s}^{-2}$ until its velocity becomes $20\,\text{m s}^{-1}$ after $4.0\,\text{s}$. Over this interval, the car's total displacement is $40\,\text{m}$. Which quantity is a scalar?
- Aa displacement of $40\,\text{m}$
- Ba time of $4.0\,\text{s}$
- Ca velocity of $20\,\text{m s}^{-1}$
- Dan acceleration of $5.0\,\text{m s}^{-2}$