# Help with velocity vs, time graph!

1. Jan 19, 2010

1. The problem statement, all variables and given/known data
Draw a velocity vs. Time graph Please I REALLY need HELP!?
7. Sketch a velocity versus time graph of Tommy in his car for the following situation. [5]

• He is waiting at a traffic light.
• He accelerates up to the speed limit.
• Travels at the speed limit for a while.
• Decelerates when he sees a red light.
• Stops at the light for a while.

2. Relevant equations
There are no equations

3. The attempt at a solution

I don't know how to draw this!
I need help

2. Jan 19, 2010

### Londoncalling

Okay, so if he is waiting at a traffic light, his velocity should=0. Time is still passing, so its a straight line but it sits on top of the x-axis (y=0). When he accelerates, his velocity will raise over time, so that's a positive diagonal line. Now he is cruising at a constant velocity. That's a straight line at some positive value of y. When he decelerates, the line goes downwards (make a negative slope) and it will eventually hit zero, where it will just go along the x-axis again.