Now the driver is speeding along at 100kmh (28m/s) and a kangaroo hops out onto the road 200m ahead. It takes the driver takes a half second to react (in which they keep moving at 28 m/s), and then the car can accelerate at 

Once again, before calculating anything, do you think they'll hit the kangaroo? Write down your answer off to the side where you'll do your working and save it.

Now, calculation: how long does it take the driver to stop in seconds? (if you think they hit the kangaroo, for a moment assume the kangaroo hops out of the way)