A sprinter crosses the finish line of a race. The roar of the crowd in front approaches her at a speed of 355 m/s. The roar from the crowd behind her approaches at 335 m/s. What are the speed of sound and the speed of the sprinter?

Archibald, an aging geezer, is out bicycling one fine afternoon, reliving his glorious youth and oblivious to the world around him. As he approaches a busy intersection, a police officer directing traffic blows his whistle to get Archie’s attention so he’ll slow down and stop. But Archie doesn’t stop; he just speeds right through the intersection as if the traffic cop wasn’t even there. The cop radios one of his colleagues and gets her to stop the old geezer. She gives him a traffic citation for failing to heed the command of a police officer directing traffic. When the case gets to traffic court, Archie explains to the judge that he didn’t hear the officer’s whistle because he is going deaf and cannot hear frequencies above 3000 Hz. The traffic cop informs the judge that his standard issue police whistle emits a frequency of 2100 Hz and he has a certificate to prove it. Thinking quickly (at least for an old geezer) Archie says that it may be true that the police whistle emits a sound…

The speed of light is 3 x 108 m/s.  If it takes sunlight 8 minutes to reach earth, how far away is the sun?

A spaceship has a length of 20 meters at rest and accelerates to high speed. A person at rest on the ground observes that the spaceship has 12 meters. How fast (in x 108m/s) is the spaceship?

A rocket goes from 0 m/s to 40 meters per second squared in 8 s.  A) after 41s, what is it's final speed in m/s? B) What length of time has passed for the rocket to reach a speed of 7100 m/s?

Earth is on average a distance of 2.25 x 1011 m away from Mars. If a radio signal is sent from Earth traveling at a speed of 3.0 x 108 m/s, how many seconds would it take to be received on Mars?