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what is the total displacement of the particle at first 4 second?

equation (x) versus (t) : X = 3T^2 - T^3 where x is in meter and t in second.

my solution is : v= 6t-3t^2 , 6t-3t^2=0 , t=2 ,

X(2)= +4 , X(4)= -16 ,: displacement of the particle at first 4 second is: -16 m

BUT I'm not sure which my answer is right. please guide me.

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# Homework Help: Find total displacement of the particle in motion

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