Delta v and change in velocity

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SUMMARY

The discussion centers on the calculation of kinetic energy change for a 5 kg object whose velocity decreases from 5 m/s to 4 m/s. The correct interpretation of the change in kinetic energy is +22.5 J, indicating an increase in kinetic energy when considering the energy absorbed by another entity. Participants emphasize the importance of context in determining the change in kinetic energy, as it can vary based on the object in question and the system involved.

PREREQUISITES
  • Understanding of kinetic energy formula: KE = 0.5 * m * v^2
  • Basic principles of physics related to motion and energy
  • Knowledge of mass and velocity units (kg, m/s)
  • Familiarity with the concept of energy transfer between objects
NEXT STEPS
  • Study the kinetic energy formula and its applications in different scenarios
  • Learn about energy conservation principles in physics
  • Explore examples of energy transfer between colliding objects
  • Investigate the implications of velocity changes on kinetic energy in various contexts
USEFUL FOR

Students studying physics, educators teaching mechanics, and anyone interested in understanding energy dynamics in motion.

Miraj Kayastha
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If the velocity of the object of 5 kg changed from 5 m/s to 4 m/s. Then is the change in kinetic energy -22.5 J or +22.5J.

doesn't change mean final velocity minus initial velocity?
 
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Miraj Kayastha said:
If the velocity of the object of 5 kg changed from 5 m/s to 4 m/s. Then why isn't the change change in kinetic energy -22.5 J. The correct answer is +22.5J.

doesn't change mean final velocity minus initial velocity?

This is vague. This is obviously from a HW/Coursework question, which you are not telling us. The "change" depends on the OBJECT IN QUESTION. Is this really the change in KE of the object that slowed down, or the change in KE of another entity that absorbed this energy change? Without you giving us the full picture, we can't tell.

If this is related to school work, please continue by presenting the full question, and what you have attempted, in the HW/Coursework forum.

Zz.
 
Miraj Kayastha said:
If the velocity of the object of 5 kg changed from 5 m/s to 4 m/s. Then is the change in kinetic energy -22.5 J or +22.5J.
Well, does the KE of the object increase or decrease?

doesn't change mean final velocity minus initial velocity?
Change in any quantity generally means 'final value' - 'initial value'.
 

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