Which of the following is NOT an example of accelerated motion?

A. an airplane taking off down a straight runway
B. a boulder falling off a cliff in a straight path
C. a ball being thrown straight up
D. a bicyclist moving in a straight line at a constant speed

Accelerated motion = any change in speed or direction.
A. No. The airplane's speed is increasing.
B. No. The boulder's speed increases as it falls.
C. No. The speed of the ball decreases as it approaches the peak, then it changes direction, begins to move downward, and its speed increases steadily after that.
D. Yes. The cyclist's speed and direction are not changing.

Answered by AL2006 | 2024-06-10

Accelerated motion refers to any motion with changing velocity, including changes in speed or direction. Most of the examples provided involve accelerated motion, except for the bicyclist moving in a straight line at a constant speed, as both speed and direction remain constant in such scenario. ;

Answered by Alana1612 | 2024-06-18

The correct answer is D, as a bicyclist moving at a constant speed does not experience any acceleration. All other options involve changes in speed or direction and are thus examples of accelerated motion. D is the only case that represents a lack of acceleration.
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Answered by AL2006 | 2024-10-01