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david_duhig
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Homework Statement
A police radar has an effective range of 1.0 km, and a motorist's radar detector has a range of 1.9 km. The motorist is going 120 km/h in a 80 km/h zone when the radar detector beeps. At what rate must the motorist decelerate to avoid a speeding ticket?
Homework Equations
v^2=u^2+2as
v=288m/s
u=432m/s
a=
t=
s=900m
The Attempt at a Solution
82944=186624+(2*a*900)
(82944-186624)/900/2
=57.6m/s^2