Hello,
I'm working on this problem:
Select all the correct answers. A particle moving along a straight line is increasing its speed if its velocity v is positive.
 its acceleration a is positive
 Both a>0 and v>0.
 Both a<0 and v<0.

I know that an object is speeding up if and only if v and a point in the same direction. So, I think the answer would be the last two, e.g.,
 Both a>0 and v>0.
 Both a<0 and v<0.

Is this correct?