Chapter 2, Problem 7P

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

Chapter
Section

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

# A motorist drives for 35.0 minutes at 85.0 km/h and then stops for 15.0 minutes. He then continues north, traveling 130. Km in 2.00 h. (a) What is his total displacement? (b) What is his average velocity?

(a)

To determine
The total displacement of the motorist.

Explanation

Given info: The speed of the motorist is 8.50â€‰km/h , the time elapsed in the first interval is 35.0â€‰min , and the displacement of the motorist in the second interval

Explanation:

The formula to calculate the displacement of the motorist in the first interval is,

Î”x1=v1Î”t1

Here,

Î”x1 is the displacement in the first interval

v1 is the velocity of the motorist in the first interval

Î”t1 is the time elapsed in first interval

Substitute 8.50â€‰km/h for v1 and 35.0â€‰min for Î”t1 to find Î”x1 .

Î”x1=(8.50â€‰km/h)((35.0â€‰min)(1â€‰h60.0â€‰min))=50

(b)

To determine
The average velocity of the motorist.

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