A 1.2-kg mass is projected up a rough circular track (radius = 0.80 m) as shown.The speed of the mass at point A is 8.4 m/s,and at point B,it is 5.6 m/s.What is the change in mechanical energy between A and B caused by the force of friction? 
Definitions:
Gymnosperms
A group of seed-producing plants that includes conifers, cycads, Ginkgo, and gnetophytes, characterized by seeds that are not enclosed by a fruit.
Chitin
A large, structural polysaccharide made from chains of modified glucose and found in the exoskeletons of arthropods and in the cell walls of fungi.
Cellulose
Polysaccharide that is the major complex carbohydrate in plant cell walls.
Desiccation
The process of drying out or removing moisture from something, often causing it to become completely dry.
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