question_answer

A stopwatch is used to time the motion of a car. At time\[{{t}_{1}}~=\text{12s}\], the car is at\[{{x}_{1}}=50\]and at\[{{t}_{2}}=15s,\]the car is at\[{{x}_{2}}=5m\]. Find the average velocity of the car.

Answer:

\[Average\,velocity=\frac{Total\,\,displacement}{Total\,\,time}\] \[{{V}_{ave}}=\frac{{{x}_{2}}-{{x}_{1}}}{{{t}_{2}}-{{t}_{1}}}=\frac{5-50}{15-12}=\frac{-45}{3}=-15m/s\]