Question

Which of the following examples demonstrates acceleration? Question 17 options: A boy running at a constant speed across the street. A car traveling at 60 mph turns left around a curve. A horse standing in a pasture. A track star is maintaining the same speed as he crosses the finish line.

Answer 1

Hey so i am taking the test and my sources say that the answer is A.) A boy running at a constant speed across the street. This is because the boy is moving at a rate that is growing while he runs. This is also known as velocity. 
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Answer 2

A boy running at a constant speed across the street.