- #1
awesome4444
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Homework Statement
The motion of a particle is expressed by a=42-12x2 where a is in m/s2 and X is in m, with the initial condition: v=0 when x=0 and t=0
Determine v when X=6
Determine X when v becomes 0 again
Homework Equations
I tried using a=dv/dt so i took the anti derivative of a to find the equation of v which turned out to be 42x-4x^3 + c and then pluged in 6 for x and found v=-612m/s
but then for the second part when i tried finding the roots of the equation b i have two answers +3.2 and -3.2
So i don't know if i should use +3.2 or -3.2
Can somone tell me if I am doing anything wrong? :(