Question

Speed cameras are used to detect motorists who break the speed limit. A number of lines 2 m apart
are painted on the road. As a speeding car crosses the painted lines, the camera takes two
photographs, 0.5 second(s) apart.

(1) 10 m/s
(2) 14 m/s
(3) 70 m/s
(4) 28 m/s

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Answer 1

Answer:

     (2) 14 km/hr

Explanation:

distance = 2m

time = 0.5 s

speed = distance / time

speed = 2 / 0.5 = 20 / 5

speed = 4m/s

4m/s = 4 × 18 / 5 km/hr = 14.4km/hr