Delta v


by Miraj Kayastha
Tags: change in velocity, delta
Miraj Kayastha
Miraj Kayastha is offline
#1
Feb11-14, 07:45 AM
P: 54
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?
Phys.Org News Partner Physics news on Phys.org
Physicists consider implications of recent revelations about the universe's first light
Vacuum ultraviolet lamp of the future created in Japan
Grasp of SQUIDs dynamics facilitates eavesdropping
ZapperZ
ZapperZ is offline
#2
Feb11-14, 07:56 AM
Mentor
ZapperZ's Avatar
P: 28,836
Quote Quote by Miraj Kayastha View Post
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.
Doc Al
Doc Al is offline
#3
Feb11-14, 08:37 AM
Mentor
Doc Al's Avatar
P: 40,905
Quote Quote by Miraj Kayastha View Post
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'.


Register to reply

Related Discussions
Sign Convention For v and x In Delta t = gamma(delta t' + v delta x') Special & General Relativity 8
Projectile Problem: Solving Theta given Delta X, Delta Y and V0. Introductory Physics Homework 9
Kinematic Equation vs. Delta velocity / Delta Time - Factor of 2? General Physics 2
Is the delta in the commutation relations of QFT a dirac delta or a kronecker? Quantum Physics 6
esimating delta S and delta H frim temp and Kb Biology, Chemistry & Other Homework 0