Suppose a car is traveling in the negative x-direction and comes to a stop. what is the sign of that car’s acceleration? how do you know?

positive - accn is slowing car moving in neg x

neg if car in pos x

The sign of acceleration is positive

Explanation:

For the car to stop, there must be a deceleration, which will gradually reduce its speed to zero, the deceleration is the aceleration in the opposite way (sign) to the movement, since in this way it will be contrary to the car's displacement and it will be able to stop it.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

the part of the wave he is travelling on is the crest