Which of these does not result in the acceleration of an object?
a.) a decrease in speed
b.) an increase in speed
c.) a change in direction
d.) maintaining a constant velocity

I guess the correct answer is the first one.

The correct answer is D.

Acceleration is defined as a change in velocity. A and B clearly demonstrate a change in velocity so are eliminated. And since velocity is a vector quantity that consists of both magnitude and direction, C is also eliminated because it has a change in direction.

Let me know if you have any questions.

answer; ///i believe that the correct answer is (45*) at a 45 degree check first good

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )