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joceees joceees
  • 06-05-2016
  • Physics
Answered

A boy is running with kinetic energy of 810j if the boy has a mass of 80kg what is his peed

Verified Answer :

Anonymous Anonymous
  • 06-05-2016

KE=(1/2)mv²  ⇒ v=√(2KE/m)

Data:
KE=kenetic energy=810 J
m=mass=80 Kg
v=velocity (speed)

v=√(2KE/m)
v=√(2*810 J/80 Kg)=4.5 m/s.

answer: his speed is 4.5 m/s.

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