A laser gun emits infrared pulses at 0.003 second intervals
toward a car travelling in the direction of the gun. If the car is 400m
away when the first pulse strikes it, how long will it take the first
pulse to reach the car and return to the gun?
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Pulses will be equal to priod, so T= 0.003 seconds,
Total distance = 4000*2 = 800 m
Total time = 800*0.003 = 2.4 seconds
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