# Homework Help: Easy Velocity Time Graph Help

1. Oct 2, 2008

### getfirefox

Hello everybody, I have a small question I need help with.

1. The problem statement, all variables and given/known data

Draw a sketch graph of the following:

"A car wich is travelling at 15 ms-1. At t (time) = 0, the driver sees a pedestrian step out into the road. The driver takes 0.7 seconds to apply the brakes, and the brakes produce an acceleration of -6ms-2, bringing the car to a rest."

Use the stetch graph to calculate the stopping distance.

2. Relevant equations

None.

3. The attempt at a solution

None. Can somebody give me an example of what the graph would look like and how I would calculate the stopping distance. I take it this would be the displacement, or area under the line on the graph.

Thanks everyone.

2. Oct 2, 2008

### tiny-tim

Hello getfirefox!

You should plot speed against time.

Constant speed is a horizontal line.

Constant deceleration is a straight line sloping down.

And yes, the stopping distance will be the area under the line.