Were is conflicting testimony in a court
case. a police officer claims that his
radar monitor indicated that a car
was traveling at 1766 kmin (llomi/h).
the driver argues that the rodar must have
recorded the relative velocity because
he was only going 88km/h (55mi/h).
is it possible that both are telling
the truth? could ondbelying? prepore
scripts for expert witnesses, for both
the prosecution and the datensc, that
use physics to justify their positions
before the jury. create visual aids to
be used as tvidence to support the
different arguments.

Lake happy times contains 100 km3 of pure water. it is fed by a river at a rate of 50 km3/yr. at time zero, there is a factory on one shore of lake happy times that begins introducing a pollutant to the lake at a rate of 2km3/yr. there is another river that is fed by lake happy times at a rate that keeps the volume of lake happy times constant. this means that the rate of flow from lake happy times into the outlet river is 52km3/yr. in turn, the flow from this outlet river goes into another lake, lake sad times, at an equal rate. finally, there is an outlet river from lake sad times flowing at a rate that keeps the volume of lake sad times at a constant 100 km3 . (a) find the amount of pollutant in lake sad times at the end of 3 months. (b) at the end of 3 months, observers close the factory due to environmental concerns and no further pollu- tant enters lake happy times. how long will it take for the pollutant in lake sad times (found in part (a)) to be cut in half?