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Paul road his bike from the bottom of his street to his friend’s

house at the top of the hill on his street. He knew his PE was
5,000 J and ME was 25,000 J but wanted to find out his KE.
What is Paul’s KE energy on his bike ride to his friend’s house? ______________

1 answer

To find Paul's kinetic energy (KE), we can use the conservation of energy principle, which states that the total mechanical energy (ME) is the sum of potential energy (PE) and kinetic energy (KE) at any point in time.

We have the following information:

  • Potential Energy (PE) = 5,000 J
  • Mechanical Energy (ME) = 25,000 J

The formula for mechanical energy is:

\[ ME = PE + KE \]

We can rearrange this equation to solve for KE:

\[ KE = ME - PE \]

Now, we can plug in the values:

\[ KE = 25,000 J - 5,000 J = 20,000 J \]

Therefore, Paul’s kinetic energy (KE) on his bike ride to his friend’s house is 20,000 J.