A particle moves along the x-axis so that its velocity at time t, for 0 < t < 6, is given by a differentiable function V, whose graph is given. The velocity is 0 at t = 0, t = 3, and t = 5, and the graph has horizontal tangents at t = 1 and t = 4.
8) During which intervals, if any, is the acceleration of the particle negative? [0, ) (4, 6]
9) During which intervals is the particle moving right? (, 5)
10) On the interval 3 < t < 4, is the speed of the particle increasing or decreasing?
11) On which intervals is the speed decreasing? Justify