contestada

A cabbie is trying to stop when he notices a fare is whistling them over. The
car has 18750 J of energy. If the cab is 2100. kg, how fast was it moving?

Respuesta :

  • K.E=18750J
  • Mass=m=2100kg
  • Velocity=v

[tex]\boxed{\sf K.E=\dfrac{1}{2}mv^2}[/tex]

[tex]\\ \sf\longmapsto 18750=\dfrac{1}{2}2100v^2[/tex]

[tex]\\ \sf\longmapsto 18750=1050v^2[/tex]

[tex]\\ \sf\longmapsto v^2=\dfrac{18750}{1050}[/tex]

[tex]\\ \sf\longmapsto v^2=17.85m^2[/tex]

[tex]\\ \sf\longmapsto v=\sqrt{17.85}[/tex]

[tex]\\ \sf\longmapsto v=4.1m/s[/tex]

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