Chapter 3.1, Problem 12SSC

(a)

To determine

The position of jogger.

Answer to Problem 12SSC

The first jogger would have an initial position of +15 m and the second jogger would

have an initial position of -15 m.

Explanation of Solution

Since both jogger have the same speed thus, the line representing their motion in the position-time graph would have the same slope of 7.5 but would differ in the initial position, such that the first jogger would have an initial position of +15 m and the second jogger would have an initial position of -15 m.

Calculation:

The graph is given below-

Conclusion:

The first jogger would have an initial position of +15 m and the second jogger would

have an initial position of -15 m.

(b)

To determine

The speed of joggers.

Answer to Problem 12SSC

The speed of joggers is (0, 7.5m/s).

Explanation of Solution

As both joggers have the same constant speed and in the same direction, thus the line representation the motion of both joggers would be the same, where the line would have a zero slope and its y-axis have a value of 7.5 m/s.

Calculation:

The graph is given below:

Conclusion:

The speed of joggers is (0, 7.5m/s).