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?

What information does a survey provide? a. an accurate description of the population surveyed b. whether there is a predictive relationship between two variables? c. whether there is a cause-and-effect relationship between two variables d. none