Chapter 2, Problem 29P

### 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 truck covers 40.0 m in 8.50 s while uniformly slowing down to a final velocity of 2.80 m/s. (a) Find the truck’s original speed. (b) Find its acceleration.

(a)

To determine
The initial velocity of the truck.

Explanation

Given Info:

The final velocity of the truck is 2.80â€‰m/s .

The displacement of the truck is 40.0â€‰m .

The time is 8.50â€‰s .

Explanation:

The formula used to calculate the average velocity is,

v=v+v02

• vÂ¯ is the average velocity
• v is the final velocity
• v0 is the initial velocity

The formula used to calculate the displacement is,

s=vÂ¯Î”t

• s is the displacement
• Î”t is the time

Substitute (v+v0)/2 for vÂ¯ find s .

s=((v+v0)/2)Î”t

Rewrite the equation in terms of v0

(b)

To determine
The acceleration of the truck.

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