A 0.50-kg ball on the end of a rope is moving in a vertical circle of radius 3.0 m near the surface of the Earth where the acceleration due to gravity, g, is 9.8 m/s2. Point A is at the top of the circle; C is at the bottom. Points B and D are exactly halfway between A and C. 
-The ball moves on the circle from A to C under the influence of gravity alone. If the kinetic energy of the ball is 35 J at A, what is its kinetic energy at C?
Definitions:
Present Value
Present value is a financial concept that calculates the current worth of a future sum of money or stream of cash flows, given a specified rate of return.
Discount Rate
The interest rate used to determine the present value of future cash flows in discounted cash flow analysis; also refers to the interest rate charged by central banks on loans to commercial banks.
Cash Flows
The complete sum of cash inflows and outflows within a corporation, severely impacting its liquidity stance.
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