Question

Ill put the question up is a sec It has a picture.... I really need help

Answer 1

Over which interval is the velocity greatest?
Over which interval(s) is the object accelerating?
The velocity of an object goes from 4 m/s to 12 m/s in 4 s. What is its acceleration?
What is the average velocity in m/s from A to B?

Answer 2

physics, but ok.

velocity is greatest A-B, since it covers the most distance in the shortest time. the object is accelerating any time the velocity is changing. the rest is just algebra

Answer 3

you need to put an interval in terms of the domain (the X values)

Answer 4

(A,B) is when its the greatest. That is because it has the largest slope. It's accelerating from (A,C) because it still has a positive slope. (D,E) may also be "accelerating" according to your proffesor because there is change in velocity, but most people would know that as "decelerating"

Answer 5

Thanks. And yes we still call it accelerating, its just a negative number with deacceleration.

Answer 6

As for the problem with acceleration, it might help to realise that the units for acceleration are metres per second per second. So it's how much speed increase in a given time - in this case 8metres / second over 4 seconds.