Afriend is riding on the back of a truck that is going away from you at 20 km/h. as the truck passes, your friend throws a ball toward you at 60 km/h relative to her. how fast is the ball going relative to you?

Since the ball moves in the relative direction opposite to the displacement of the car, the speeds must be subtracted, so

Both move opposite directions. The attached graphic helps to better appreciate the problem in question, which concludes that the relative speed is 40km / s

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation:

i don’t know what the answer is i wish i