   Chapter 4, Problem 13P

Chapter
Section
Textbook Problem

A 970.-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it reaches a speed of 25.0 m/s. What is the average force exerted on the car during this time?

To determine
The average force exerted on the car.

Explanation

Section 1:

To determine: The acceleration of the car.

Answer: The acceleration of the car (a) is 5ms2 .

Explanation:

Given info: The mass of the car is 970kg and its velocity is 25 m/s. The total time taken is 5.00 s.

The formula for acceleration is,

a=Δvt                                                       (I)

• Δv is the change in velocity.
• t  is the total time taken.

Substitute 25 m/s for Δv and 5.00 s for t in Equation (I) to get a.

a=25m/s5s=5ms2 (II)

The acceleration of the car is 5ms2

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