Posted by Jose on Monday, September 12, 2011 at 11:13pm.
The braking distance is proportional to the kinetic energy, which means it is proportional to the square of the velocity.
So, multiply 8 ft by (40/25)^2.
You should get about 20.5 ft.
There will be an additional distance travelled while the driver responds to the emergency and applies the brake. That distance is proportional to speed, but they probably expect you to ignore it.
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