Question

The velocity-time graph of a car moving on a straight road is shown. Calculate the acceleration of the car during the last $8s$ :

• A. $-2.5m{s}^{-2}$
• B. $-1.5m{s}^{-2}$
• C. $0$
• D. Can not be determined from the given plot

Answer 1

The correct option is A $-2.5m{s}^{-2}$

Acceleration in the last $8s=$ slope of the line BC $=\frac{BD}{CD}=\frac{(0-20)}{(13-5)}=\frac{-20}{8}$ $=-2.5m{s}^{-2}$