Chapter 2, Problem 66A

(a)

To determine

The time Person J and Person H at the same place.

Answer to Problem 66A

After 1 hour,Person J and Person H at same place.

Explanation of Solution

Introduction:

Positiontime graph is drawn by measuring the object displacement with respect to time. Position time graph gives the position of any given object for the specific time.

From graph, it is seen that Person J started late than Person H. But the position time graph of both meet at one point. Both meet after 6km of paddling canoes in local driver and corresponding time is 1 hour.

Conclusion:

Both meet after 1 hour.

(b)

To determine

The Person Jpaddle before the passing Person H.

Answer to Problem 66A

Person J spend 45 min before Person H

Explanation of Solution

Introduction:

Position time graph is drawn by measuring the object displacement with respect to time. Position time graph gives the position of any given object for the specific time.

From graph it is seen that Person J started 15 min late than Person H. At 6 km both meet.And then Person J overtakes Person H. Person Jcovers 6km distance in 45 min from his starting point.

Conclusion:

So,Person J paddle in river is 45 min before passing Person H.

(c)

To determine

The point on the river might have swift current.

Answer to Problem 66A

6 km to 9 km from origin there might be swift current in river.

Explanation of Solution

Introduction:

Position time graph is drawn by measuring the object displacement with respect to time. Position time graph gives the position of any given object for the specific time.

From the graph, it is seen that Person Jand Person H moving steadily in river up to 6 km. After 6 km there is sharp increase in graph seen for both up to 9 km.

Conclusion:

From 6 km to 9 km from origin, there might be swift current in river.