Hello! I was hoping somebody could help me with these two problems: A roller-coaster has a first hill 75.2 meters tall. Immediately after this hill, the roller coaster skims along the ground, then ascends to a second hill 47.8 m tall. If the load limit is 1067.9 kg, how fast is it going at the top of the second hill? As always, no units and 2 decimal places. The owners of the amusement park have now decided that having a large first hill is too old-fashioned; they now want to use a spring to start the roller coaster. If the starting gate limits the spring to 3.3 meters of compression, and the next hill is now 44.4 meters, what must the spring constant be to lift a load limit of 2280.9 kg to the top with a minimum speed of 18.4? As always, no units and 2 decimal places. Thank you so much in advance!