A car moves along the x axis. What is the sign of the

Chapter 2, Problem 2EC

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QUESTION:

A car moves along the x axis. What is the sign of the car’s acceleration if it is moving in the positive x direction with (a) increasing speed or (b) decreasing speed? What is the sign of the acceleration if the car moves in the negative x direction with (c) increasing speed or (d) decreasing speed?

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QUESTION:

A car moves along the x axis. What is the sign of the car’s acceleration if it is moving in the positive x direction with (a) increasing speed or (b) decreasing speed? What is the sign of the acceleration if the car moves in the negative x direction with (c) increasing speed or (d) decreasing speed?

ANSWER:

Step 1 of 4

(a)

When the car is moving in a positive x direction with increasing speed, the acceleration of the car is also positive, hence its positive.

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