An object is moving along the x-axis. At t = 0 it is at x = 0. Its x-component of velocity vx as a function of time is given by vx(t) = at - bt3, where a = 8.0 m/s2 and b = 4.0 m/s4. (a) At what nonzero time t is the object again at x = 0? (b) At the time calculated in part (a), what are the velocity and acceleration of the object (magnitude and direction)?

An object is moving along the x-axis. At t = 0 it is at x = 0. Its x-component of velocity vx as a function of time is given by vx(t) = at - bt3, where a = 8.0 m/s2 and b = 4.0 m/s4. (a) At what nonzero time t is the object again at x = 0? (b) At the time calculated in part (a), what are the velocity and acceleration of the object (magnitude and direction)?

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