- #1
mmattson07
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Homework Statement
The only force acting on a 4.3 kg body as it moves along the positive x-axis has an x component Fx = -8x N, where x is in meters. The velocity of the body at x = 1.6 m is 11 m/s. (a) What is the velocity of the body at x = 4.5 m? (b) At what positive value of x will the body have a velocity of 2.7 m/s?
Homework Equations
F=ma , m=4.3kg, F(x)=-8x
=>v^2=v0^2+2ad
The Attempt at a Solution
a)
=>-8(1.6)/4.3= a = -2.977 m/s^2
=>v^2=v0^2+2ad
=> v^2=(11)^2+2(-2.977)(4.5-1.6)=86.467
=>v=9.299 m/s
b) Here is what I tried:
=>v^2=v0^2+2ad
=>(2.7)^2=(11)^2+2(-2.977)(Xf-1.6)
=>7.29=121-5.954Vf+9.5624
=>Xf=(-113.71+9.5624)/-5.954
=17.492 m
Need to know if this is correct only one submission left.