torijohnson torijohnson
  • 09-10-2016
  • Physics
contestada

A sprinter has a mass of 80 kg and a KE of 4000 J. What is the sprinter’s speed?

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MATTG99
MATTG99 MATTG99
  • 09-10-2016
There you go.

Hope this helps!
Ver imagen MATTG99
Answer Link
AL2006
AL2006 AL2006
  • 10-10-2016

               Kinetic Energy  =  (1/2) (mass) (speed)²

                         4,000 J  =  (1/2) (80 kg) (speed)²    

Divide each side
by  40 kg :            4,000 J / 40 kg  =  speed²

                                    100 m²/s²  =  speed²
Square root
each side:                         10 m/s  =  speed
Answer Link

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