Mathematics · Speed, Time and Distance
A car is moving collinearly with a laser beam emitted by a transceiver. A laser pulse emitted at t = 0 s is received back by the transceiver 100 ns later after reflection from the car. A second pulse emitted at t = 0.1 s is received back 90 ns later. Given the speed of light is 3 × 108 m/s, the average speed of the car in this interval is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1108 km/h, moving away from the transceiver
- 254 km/h, moving away from the transceiver
- 3108 km/h, moving towards the transceiver
- 454 km/h, moving towards the transceiver✓
Correct answer
54 km/h, moving towards the transceiver
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