A particle moves along a line so that at time t, where 0 is less or equal to t less or equal to pi, its position is given by s(t) = -4cos(t)- (t^2/2) + 10. What is the velocity of the particle when its acceleration is zero?

Among the following environmental factors, which does not have a long-term impact on the composition of a region's soil? a. kinds of crops grown b. types of fungi present c. topography of the landscape d. variety of species of mammals e. number of freezes occurring annually