Question

speed cameras are used to detect motorists who break the speed limit . a number of lines 2m apart are painted on the road. as a speeding car crosses the painted lines, the camera takes two photographs,0.5 seconds apart. the speed of car in the photographs is

Answer 1

Dear Student
Speed camera takes two photograph 0.5 sec apart.During this time speeding car crosses the painted lines 2m
apart.
We know, velocity(v)=distance(d)/time(t)
Here distance is 2m and time is 0.5 second.
So velocity(v)=2m/0.5sec=4m/sec
The speed of the car in the photograph is 4m/sec=14.4km/hour


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