A submarine is fixed under water and emits two sound wave pulses into the water in the forward direction and then detects the echoes reflected from a moving object ahead. If the time interval between the two emitted pulses is 10s and the round trip travel time intervals are 2s and 2.1s respectively,what is the average speed of the object moving away from the submarine?(speed of sound in water is 1500m/s
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d=(2.1-2)s ×1500m/s = 150m
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