Tuesday, 4 September 2007 - 9:09 PM EDT

You all better comment on this tonight!

Tuesday, 4 September 2007 - 9:54 PM EDT

I would say that an object can be increasing in speed while decreasing in acceleration.  An example would be a car going from 0-60 in 4 seconds.  Then, over the next 4 seconds, the car gets up to 70.  The car would still be increasing its speed but it wouldn't be accelerating as fast.

Tuesday, 4 September 2007 - 10:01 PM EDT

I would say that dennis's example was perfectly said. Before i read his i actually felt that if a car is increasing speed it cant be decreasing its acceleration, but after reading his example i changed my mind. It seems that a car is a perfect example because you can stop accelerating but the car could still increase its speed as dennis said. Just because you let off of the gas doesnt always mean the car will immediatly slow down.

Tuesday, 4 September 2007 - 10:06 PM EDT

I completely agree Kevin.

Tuesday, 4 September 2007 - 10:50 PM EDT

I agree with both of the comments already made.  Dennis' example was also along the lines of what I was thinking in how to prove that an object can be increasing in speed but decreasing in acceleration.  Since speed is distance over time and acceleration is velocity over time, the situation he described makes sense.  The slowing down of the car is a negative velocity since it has a negative displacement over time, making the acceleration also negative.  But since the car is still traveling more distance in that time, the speed is increasing.

Wednesday, 5 September 2007 - 9:22 AM EDT

I agree with every one else that Dennis’s example is the situation descried in the question. They all have explained this situation very well. The only thing that I could thing of to add to their explanation would be that as long as the acceleration remains positive then the answer is yes. But, if it were to slow down after accelerating then the answer to the question be no.