Sunday, March 18, 2012

Surfing For Reaction Distance Car?

Thomas asks…Physics Question: A car is traveling at 25 m/s and the driver sees a traffic light turn red. After 0.600 s ?(the reaction time) the driver applies the breaks, and the car decelerates at 7.00 m/s^2. What is the stopping distance of the car, measured from the point where the driver first notices the red light?Nancy answers:Vo=25
V=0
a=-7
d= ?
T=x

V=25
t= .6
d= ?

V=d/t
d= .024

V^2=Vo^2 + 2ad
0=625+2(-7)d
d= 44.6Charles asks…Suppose a car is traveling at 15.0 m/s, and the

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