The position of a particle which moves along a straight line is defined by the relation x = t3 − 6t2 − 15t + 40, where x is expressed in feet and t in seconds. Determine:  the time at which the velocity will be zero, the position and distance traveled by the particle at that time, and                                                                              .the distance traveled by the particle from t = 4s to t = 6s.

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