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10. 0.30 s after seeing a puff of smoke rise from the starter's pistol, the sound of the firing of the pistol is heard

10. 0.30 s after seeing a puff of smoke rise from the starter's pistol, the sound of the firing of the pistol is heard by the track timer 100 m away. What is the velocity of sound? Hint: treat the speed of light as instantaneous.

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