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I am having trouble figuring out when I am trying to solve aword problem in phys

ID: 1744974 • Letter: I

Question

I am having trouble figuring out when I am trying to solve aword problem in physics for velocity whether I use themomentum equation P1i + P2i = P1f + P2f  (m1v1i + m2v2i =m1v1f + m2v2f) or the Kf + Uf = Ki +Ui. My biggest problem comes when I am asked to find the velocityof a particle, for some reason I just cant tell which equation touse. Sometime it will ask you to find the kinetic energy or themomentum, which i understand then which to use, but for the mostpart I keep using the wrong one. Is there some rule to go by when decided which to use? Willthere be an indication in the question? I am having trouble figuring out when I am trying to solve aword problem in physics for velocity whether I use themomentum equation P1i + P2i = P1f + P2f  (m1v1i + m2v2i =m1v1f + m2v2f) or the Kf + Uf = Ki +Ui. My biggest problem comes when I am asked to find the velocityof a particle, for some reason I just cant tell which equation touse. Sometime it will ask you to find the kinetic energy or themomentum, which i understand then which to use, but for the mostpart I keep using the wrong one. Is there some rule to go by when decided which to use? Willthere be an indication in the question? My biggest problem comes when I am asked to find the velocityof a particle, for some reason I just cant tell which equation touse. Sometime it will ask you to find the kinetic energy or themomentum, which i understand then which to use, but for the mostpart I keep using the wrong one. Is there some rule to go by when decided which to use? Willthere be an indication in the question?

Explanation / Answer

in general, conservation of momentum is used in collisions.Kinetic energy and potential energy is generally used to describesystems where changes in height, or springs are present. Energyalso describes the amount of Work that forces can do.

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