- #1
gijungkim
- 50
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Homework Statement
A 2.0-kg body moving along the x-axis has a velocity vx = 5.0 m/s at x = 0. The only force acting on the object is given by Fx = (–4.0x) N, where x is in m. For what value of x will this object first come (momentarily) to rest?
Homework Equations
0.5 mv^2 = KE
F*d = work
The Attempt at a Solution
Since KE = 0.5 * 2 * 5^2 = 25J
and F*d = -4.0x^2
-4x^2 = 25J
x = 2.5 m
This is how I approached it, but the answer is 3.5m. Can anyone help me out?