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A 1100-kg car coasts on a horizontal road with a speed of
Chapter 7, Problem 28P(choose chapter or problem)
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.
Questions & Answers
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: .
The initial speed was: .
After crossing the sandy road, the final speed became,
.