tires run over them. The time between the two signals is 0.4 seconds. 1) Calculate the speed of the car in mph. (This may speed your conversion: 88 ft/s = 60 mph.) 2) how might someone evade the speed trap, if he spots it just as he's about to hit the first signal?

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Chapter28: Special Relativity
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Two triggers, 20 feet apart, activate when a car's tires run over them.  The time between the two signals is 0.4 seconds. 

1) Calculate the speed of the car in mph.  (This may speed your conversion: 88 ft/s = 60 mph.)

2) how might someone evade the speed trap, if he spots it just as he's about to hit the first signal?

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