A freight company uses a compressed spring to shoot 2.00 kg packages up a 1.00-{\rm m} -high frictionless ramp into a truck, as the figure shows. The spring constant is 331 N/m and the spring is compressed 35.0 cm.
What is the speed of the package when it reaches the truck?
A careless worker spills his soda on the ramp. This creates a 50.0-{\rm cm}-long sticky spot with a coefficient of kinetic friction 0.300. Will the next package make it into the truck?