A Sprinter Named Ben Has Challenged a Beam of Light

question 80

Multiple Choice

A sprinter named Ben has challenged a beam of light to a race in the 100-meter dash.The race is held in a stadium full of spectators.At the start signal,a laser beam is turned on at the start line,pointed down the track.At the same instant,Ben bursts out of the starting blocks at 99% of the speed of light (0.99c) .According to the spectators watching in the stands,what happens? (Assume they could somehow watch a slow-motion replay to see what occurred. )

• A)The light beam wins the race,but barely-it is going 1% of the speed of light faster than him.
• B)The light beam instantly finishes the race,before Ben even has a chance to start.
• C)The light beam wins the race by a large margin because it is going faster than him by the full speed of light.
• D)Ben beats the light beam to the finish line,becoming a hero.

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