What is the answer to this question? Two large books are stacked on top of each other on a table(Figure 3). The mass of each book is 6.5 kg. Given that the coefficient of static friction between the bottom book and the table is 0.15, what is the lowest the coefficient of static friction between the books can be in order to apply force and move both books?

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.