the position of a particle as a function of time is given by x=(2.0m/s)t +(-3.0m/s^3)t^3. (a) plot x versus t for time from t=0 to t=1.00s. (b) find the average velocity of the particle from t=0.150s to t=0.250s. (c) find the average velocity from t=0.190s to t=.210s (d) do you expect the instantaneous velocity at t=0.200s to be closer to -1.62m/s or -1.66m/s? Explain

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I know, I ve been tryna solve it, I just want to know if my formula am using, is correct, so I will be glad, if you give me the rite formula. Thanks