How Far Does Superwoman Travel in the First 8 Seconds?

[kencamarador]

It's an easy question but I am not getting the correct answer as the book states.

Superwoman is flying at 108km/h. She decelerates at a constant rate to 36km/h

How far in meters does super woman travel in the first 8 seconds?

They told me to draw a velocity time graph which I did. I found the area of the first 8 seconds

http://imgur.com/UDBvOZW

ATriangle+ARectangle

=(8*72)/2 + 8*36
=288+288
=576km/h which is 160m/s

But the correct answer is 200...

 

[haruspex]

Superwoman is flying at 108km/h. She decelerates at a constant rate to 36km/h
How far in meters does super woman travel in the first 8 seconds?

You seem to have misstated the problem a little. It must have said that she took 8 seconds to decelerate to 36km/h.

=(8*72)/2 + 8*36

Try including units in there and see what happens.

160m/s

That's a speed, not a distance.