Packages having a weight of 15 lb are transferred horizontally from one conveyor to the...

Packages having a weight of 15 lb are transferred horizontally from one conveyor to the next using a ramp for which μ_k = 0.15. The top conveyor is moving at 6 ft/s and the packages are spaced 3 ft apart. Determine the required speed of the bottom conveyor so no sliding occurs when the packages come horizontally in contact with it. What is the spacing s between the packages on the bottom conveyor?