How do you find final velocity with initial velocity and energy gained?

  • Thread starter lanruoer
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Homework Statement


It gives the mass, energy gained (change in energy), initial velocity and power and time
I need to find final velocity

Homework Equations



EK= 0.5mv^2

The Attempt at a Solution


I was thinking of plug in the number into above formula but if i do this i wont be using the initial velocity. Also i'm confused about change in energy and energy.. is there any difference?
 

Answers and Replies

  • #2
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You will need the initial velocity because you are given the "Change" in energy.

delta (KE) = 0.5*m*(vf - vi)^2


Also the difference between energy and change in energy is simple that, energy is the total energy of a body at a given time. Change in energy is the difference of the total energy at two time instants.

Hope this helps! :smile:
 

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