Answer: b the slope of a velocity vs. time graph
d. .a vector
Explanation: Acceleration is the rate of change of velocity with time. Slope of the graph of any quantity plotted against time gives the rate of change of that quantity with respect to time. In case of velocity, the slope gives the rate of change of velocity with time which is acceleration.
Acceleration is a vector quantity because it has both magnitude and direction. and is measured in [tex]ms^{-2}[/tex]
The change in displacement divided by the change in time gives velocity. Velocity is measured in m/s.
