Chapter 2, Problem 69A

(a)

To determine

The time of stopwatch of second car.

Answer to Problem 69A

The time of stopwatch of second car $5.5+0.5=6\text{ hrs}$ .

Explanation of Solution

So, when the both car meet then

$x_1=x_2$

The graphical representation between time and position is given below:

  $\begin{array}{l}36(t+0.5)+48=48t\\ 36t+18+48=48t\\ 66=12t\\ t=5.5\text{h}\end{array}$

Conclusion:

Remember though, it wants the stopwatch reading. The time t we just found the second car has the stopwatch will read the time as

  $5.5+0.5=6\text{ hrs}$

(b)

To determine

To find:The position second car.

Answer to Problem 69A

The position of second car is $position=264km$ .

Explanation of Solution

Just plug the time into one of the position equations then, we get the position.

Calculation:

  $\begin{array}{l}{x}_2=48\times 5.5\\ x_2=264\text{km}\end{array}$

Conclusion:

The position of second car is $264\text{km}$ .