How Does Hitting a Wall Affect Kinetic Energy?

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SUMMARY

The discussion centers on calculating the change in kinetic energy (KE) when Wiley Coyote, with an inertia of 1000 kg, collides with a wall while traveling at 5 m/s. The correct method to determine the change in KE is to use the formula 1/2mv^2, where the initial velocity is 5 m/s and the final velocity is 0 m/s after the collision. The change in KE is calculated as the difference between the initial and final kinetic energy, confirming that the approach is accurate and straightforward.

PREREQUISITES
  • Understanding of kinetic energy formula (KE = 1/2mv^2)
  • Basic knowledge of physics concepts such as inertia and momentum
  • Familiarity with the concept of center of mass
  • Ability to perform basic algebraic calculations
NEXT STEPS
  • Research detailed examples of kinetic energy calculations in physics
  • Learn about the principles of momentum conservation during collisions
  • Explore the effects of different materials on collision outcomes
  • Study the concept of impulse and its relation to force and time during impacts
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in understanding the principles of kinetic energy and collision dynamics.

pxp004
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Wiley Coyote and his Acme rocket, together having inertia of 1000 kg, are speeding after Roadrunner. Upon seeing a large brick wall in his path, Coyote tries to slow down. Unfortunately, he’s still going 5 m/s when he runs into the wall. The wall is not affected, but the rocket crumples (the coyote hangs on), such that the center of mass of the rocket/coyote travels forward 50 cm between striking the wall and coming to rest.

What is the change in kinetic energy of center of mass of the coyote/rocket combo?

Would you just use 1/2mv^2?

I know the center mass velocity equation but that doesn't seem to help. Change in KE would be Initial - Final. Final would be 0 so i just thought that the change in Kinetic would be 1/2mv^2. Is this right?
 
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hi pxp004! welcome to pf! :smile:

(try using the X2 button just above the Reply box :wink:)
pxp004 said:
Change in KE would be Initial - Final. Final would be 0 so i just thought that the change in Kinetic would be 1/2mv^2. Is this right?

yup! that simple! :biggrin:
 

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