Read the scenario. a horse accelerates +2 mi/h/s south. which option defines the horse’s acceleration?
a. the horse’s speed changes to 2 mi/h as the horse moves south.
b. the horse’s speed decreases by 2 mi/h every 1 s.
c. the horse’s position decreases by 2 mi every 1 s as the horse moves south.
d. the horse’s velocity increases by 2 mi/h every 1 s as the horse moves south.

D) The horse’s velocity increases by 2 mi/h every 1 s as the horse moves south

Explanation:

Let's analyze all options:

A. The horse’s speed changes to 2 mi/h as the horse moves south The horse's speed is not 2 mi/h, but it increases 2 mi/h every second. So, this is false.

B. The horse’s speed decreases by 2 mi/h every 1 s. It would only decrease if the horse was moving north. Otherwise this is false.

C. The horse’s position decreases by 2 mi every 1 s as the horse moves south. It is not horse's position but its velocity what changes 2mi/h every second. Also false.

D. The horse’s velocity increases by 2 mi/h every 1 s as the horse moves south. Since given acceleration is positive, you can say that its velocity increases 2mi/h every second.  So, this is true

snell's law

refractve index = sin incidence / sin refraction