Question

How fast should a boy of 40 kg mass run,so that the kinetic energy becomes 800(j)

Answer 1

Answer:

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Answer 2

Answer:

The velocity of a boy is 6.324 m/s.

Step-by-step explanation:

Energy is the ability to perform work in physics. It may exist in different forms, including potential, kinetic, thermal, electrical, chemical, radioactive, and more. In addition, energy is transferred from one body to another through effort and heat. Hence, the heat transmitted may manifest as thermal energy while work performed may result in mechanical energy.

Given,

m = 40 kg

KE = 800J

The kinetic energy is,

KE = (1/2)mv²

$v = \sqrt{\frac{2KE}{m}}$

v = √(2×800)/40

v = √40

v = 2√10 m/s

v = 6.324 m/s

Hence, the velocity of a boy is 6.324 m/s.

To learn more about the kinetic energy, click on the link below:

https://brainly.in/question/1797886

To learn more about the velocity, click on the link below:

https://brainly.in/question/36267867

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