WAEC Physics 2019 Paper

Concept:Acceleration is defined as the time rate of change of velocity.Explanation:When an object's velocity increases over time, the rate at which this increase happens is called acceleration.It tells us how much velocity changes in each unit of time.Mathematically, acceleration $a$ is the change in velocity $\Delta v$ divided by the time taken $\Delta t$:$$a = \frac{\Delta v}{\Delta t}$$Here, $\Delta v$ is the increase in velocity and $\Delta t$ is the corresponding time interval.In SI units, acceleration is measured in metres per second squared, expressed as $\mathrm{m\,s^{-2}}$.Therefore, among the given options, the time rate of increase in velocity is acceleration.Answer:C. acceleration