- #1
cretin66
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Homework Statement
I am trying to find the final velocity from the given data
Work - 3000J
Mass - 1/2d (d = distance travelled)
Initial Velocity - 7m/s
Time - 7 seconds
Homework Equations
W=change in energy
W=Fd
The Attempt at a Solution
W =work
F=force
m=mass
a=acceleration
d=distance traveled
vf= final velocity
v0=initial velocity
t=time
Attempt #1
W=Fd
W=mad
3000=1/2d[2]a
W=1/2(vf + v0/2t)[2](vf - v0/t)
and by solving this equation...
vf[3] + 7vf[2] - 49vf - 343 = 3000
I've tried putting everything equal to zero and using a graphing calculator to solve for the x-intercept, and using a check i found that i had the wrong answer, it's possible that my algebra was done improperly, or I am approaching the problem the wrong way, please help.
The answer i got was vf = 230.84
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