Calculating Final Velocity with Given Work and Mass

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Homework Help Overview

The problem involves calculating the final velocity of a mass given the work done on it and its mass. The subject area is primarily focused on concepts of work and energy in physics.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • The original poster expresses uncertainty about which formula to use for the problem. Some participants discuss the relationship between work and kinetic energy, suggesting that work done is equal to the change in kinetic energy.

Discussion Status

Participants are exploring different interpretations of the problem and discussing relevant formulas. Some guidance has been offered regarding the connection between work and kinetic energy, but there is no explicit consensus on the approach to take.

Contextual Notes

The original poster has indicated that they have attempted some calculations but are unsure about the correct method to apply. There may be constraints related to the homework guidelines that affect the discussion.

dasher141
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Homework Statement


I don't know how to solve this question.

28.8J of work were done in accelerating a mall of 1.8 kg from rest. Find its final velocity. I'm not sure which formula to use..

Homework Equations


F=ma
W=Fs
KE=1/2 mv^2

The Attempt at a Solution


I can't figure out which formula to use. (did some working in my workbook)
 
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Hi dasher141. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif

Work and Energy have the same units, so are basically the same thing. I like the formula "work done = change in kinetic energy"
 
Last edited by a moderator:
A=Wk2-Wk1, Wk1=0 →
→ A=Wk1=mV2/2 → V=[itex]\sqrt{}(2A/m)[/itex]
 
Sorry, made a mistake in second line. A=Wk2
 

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