An object of mass m is at rest on a rough inclined plane with height h, length 8 m, and which makes an angle of 30° with the horizontal, as shown in Fig. 8-7. The coefficient of kinetic friction on the inclined plane is 0.4. What is the speed of the object at the bottom of the inclined plane? Express your answer in m/s. Write done the number only. Keep two significant figures 2: A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling west at 20.0 m/s. The cars stick together. What is the speed of the wreckage just after the collision? Express your answer in terms of m/s. Write done the number only. Keep two significant figures.