Martin walked away from his school at a constant velocity for the first 30 seconds. he realized that he had to pick up a book from his friend's house which he had already passed. he turned around and walked to his friend's house at a constant velocity for 10 seconds. he stopped at his friend's house for 40 seconds and then walked away from school again at a constant velocity for the next 20 seconds. which of the following graphs best represents martin's motion?

The below graph shows Martin's motion.  

Step-by-step explanation:

let x represents the time(in seconds) and y represents the displacement in x seconds.

According to the question,

At first he walked away from the school for 30 second .

Thus, we will get a line having positive slope.

After that, he turned around and walked to his friend for 20 second.

Thus, we will get  a line having negative slope.

Now he wait 40 second in his friend's house.

Thus, after that we get a line that is parallel to x-axis.

Now, He again goes towards his school for 20 seconds,

Thus, we get a line having positive slope.

Therefore, Below graph shows his motion,

answer: i don't understand. what are the options

step-by-step explanation:

la parábola es el lugar

geométrico en el cual los puntos tienen una distancia idéntica, equidistantes,

de un punto denominado foco, f, y una recta denominada directriz

el radio vector de una

parábola es el segmento que existe entre un punto cualquiera y el foco.

por la ecuación se observa

que la parábola abre hacia la derecha, por lo cual podemos usar las siguientes fórmulas

la ecuación ordinaria de la

parábola es y^2 = 4px, donde p es la longitud desde el vértice de la parábola al

foco.

la fórmula de la directriz

es x + p = 0

resolviendo:

y^2-9x = 0

y^2 = 9x

4p = 9, entonces p = 9/4

entonces el foco tendrá la

coordenada f(9/4,0)

la directriz vendrá

expresada por

x + p = 0

x = -p

x = -9/4

el problema indica que la

ordenada es igual a 6, entonces

(6)^2=9x

x = 36/9

x = 4

entonces el punto al cual

hay que obtener la distancia será p(4,6)

calculando se tendrá: pf = 

pf = 6,25 u

ver más en -

step-by-step explanation: