1. In the figure below; a particle of mass 25.0kg slides from rest at the top of an inclined surface. All surfaces are frictionless, except the surface AB, which is frictional with coefficient of kinetic friction between the particle and the surface as 0.20. After point C, the particle then collides with a stationary block of mass 15.0kg (see the figure), After collision they stick together and the combined object continues moving to the right and compresses a spring of spring constant 15.0N/m.(g=9.81mss2) (a) Find the work done by gravity when the particle moves from the top (point O ) to point A. (b) Find the speed of the particle at C. (c) Find the speed of the combined object just after collision. (d) Find the maximum compression in the spring. (2 pts) (4 pts) (3 pts) (3 pts)