You testify as an expert witness in a case involving anaccident in which car A s

Question

You testify as an expert witness in a case involving anaccident in which car A slid into the rear of carB, which was stopped at a red light along a road headeddown a hill (Figure 6-25). You find that the slope of the hill is = 12.0°, that the cars were separated by distanced = 22.0 m when the driver of car A put the carinto a slide (it lacked any automatic anti-brake-lock system), andthat the speed of car A at the onset of braking wasv0 = 19.0 m/s. With what speed did carA hit car B if the coefficient of kineticfriction was 0.120 (road surface covered with wet leaves)?

Explanation / Answer

=12 d=22 V(start)=19 F(net) = ma = mgsin-mgcos a= gsin-gcos V(finil)^2= V(start)^2 +2ad V(finil)^2= V(start)^2 +2d(a= gsin-gcos) V(finil)=20.0

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