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Physics / Physics with MasteringPhysics 4 / Chapter 7 / Problem 28P

Physics with MasteringPhysics | 4th Edition | ISBN: 9780321541635 | Authors: James S. Walker

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A 1100-kg car coasts on a horizontal road with a speed of

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QUESTION:

Problem 28P

A 1100-kg car coasts on a horizontal road with a speed of 19 m/s. After crossing an unpaved, sandy stretch of road 32 m long, its speed decreases to 12 m/s. (a) Was the net work done on the car positive, negative, or zero? Explain. (b) Find the magnitude of the average net force on the car in the sandy section.

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QUESTION:

Problem 28P

A 1100-kg car coasts on a horizontal road with a speed of 19 m/s. After crossing an unpaved, sandy stretch of road 32 m long, its speed decreases to 12 m/s. (a) Was the net work done on the car positive, negative, or zero? Explain. (b) Find the magnitude of the average net force on the car in the sandy section.

ANSWER:

Step 1 of 3

Here we need to find whether the work done is positive, negative or zero.

The mass of the car is: $m=1100\ kg$ .

The initial speed was: ${v}_{i}=19\ m/s$ .

After crossing the sandy road, the final speed became,

${v}_{f}=12\ m/s$ .

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