Which of the following choices is correct about the information shown on the graph below?

Question

anonymous · Answer

1. First the acceleration decreases, then it increases.
2. The acceleration shown on this graph does not change.
3. First the acceleration increases, then it decreases.
4. The acceleration shown on this graph begins to decrease at the 2 second mark. (help me i dont know)  @kelci2014   @nathshely   @Awesome781   @henrycharles   @JoyLin   @johnweldon1993

anonymous · Answer

3?

johnweldon1993 · Answer

Well since we know the acceleration would be the change in speed at a certain time...

We can see that the speed definitely changes so there is some acceleration change (B is out)

Does the speed go up first or down first? well it goes up...to the acceleration goes up...stops (speed turns constant for some instant and then drops back down)

Looks like we would have 3 here

anonymous · Answer

Thanks you guys

anonymous · Answer

i got the other 4 down on my own

anonymous · Answer

3 is correct. (Sorry. Was busy.) You know the acceleration doesn't decrease and then increase because otherwise there would be a dip(opposite to the graph shown). Also, because there is a slope, you know the acceleration must be changing. When looking at the 2 second mark, the line continues upwards, not downwards. By elimination, the answer is 3. However, by further analysis, the line goes up and then down. That indicates an increase and then a decrease. Hope that helps for future problems modeled similarly.

anonymous · Answer

*a changing slope