The diagram below shows the potential energy of a system. A 3.20-kg block starts at rest and slides a distance d down a frictionless 30.0 o incline, where it runs into a spring. A mass tied to a string swings around in a horizontal circle of radius R with the string keeping a constant angle to the vertical. The mass travels at a speed of v . In the diagram below, assume that the force F is exactly the right size so that the mass M 3 remains at a fixed height.
All surfaces are frictionless.
Be sure to label the problem number.