A $100\,\text{m}$ sprint begins when a gun is fired. The gun produces a bang and a puff of smoke at the same instant. At what point does the finishing judge see the smoke, and at what point does he hear the bang?
- Asees the smoke: almost immediately; hears the bang: almost immediately
- Bsees the smoke: almost immediately; hears the bang: after about $0.3\,\text{s}$
- Csees the smoke: after about $0.3\,\text{s}$; hears the bang: almost immediately
- Dsees the smoke: after about $0.3\,\text{s}$; hears the bang: after about $0.3\,\text{s}$