physics
posted by jel .
a car is traveling at 40.0 m/s. the drivers sees an emergeny ahead and 0.50 s later slams on the brakes. the acceleration of the car is 4.0 m/s^2.
a. what distance will the car travel before it stops?
b. if the driver was able to apply the brakes instantaneously without a reaction time, over what distence would the car stop?
c. assume your car was traveling at 30.0 m/s instead. without performing any calculations, would the answer now be less than, equal to or larger than before? explain your answer.

vi=40m/s
timedelay=.5s
a= 4m/s^2
vf^2=vi^2+2(4)d
solve for d when vf=0, then
d= vi*t 1/2*4*(t.5)^2 
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