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A 70 kg bicyclist rides his 9.8 kg bicycle with a speed
of 16 m/s.
How much work must be done by the brakes to bring the bike and rider to a stop?

Respuesta :

Kei2005

Answer:

Hello,

QUESTION)

✔ We have Ek = 1/2m x v²

  • Ek = 1/2 x 79.8 x 16²
  • Ek = 10 214.4 J

In order to come to a complete stop, the cyclist must convert all his kinetic energy into thermal energy. Given that the braking force opposes movement, the work is therefore resistant, i.e.  W = -10 214.4 J.

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