A cannonball is fired at v0 = 100 m/s from a barrel tilted upward at θ0 = 28 ∘.Find an expression for the cannonball's direction of travel, measured as an angle from horizontal, after traveling horizontal distance d  1-.Express your answer in terms of some, all, or none of the variables θ0 , v0, d, and the free-fall acceleration g.  2-How far has the cannonball traveled horizontally when it reaches its maximum height? 3-What is the angle after the cannonball travels 600 m? Assume that it is fired off the cliff.

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Central Force

Central force is the force that acts along the center of mass of one body to the center of mass of another body. Its direction from or away from a point on a body to another is called the center of the force. Such forces include gravitational force between two massive objects or electrostatic forces between two charged particles. So from atoms to planets, the central forces play an important role in shaping our daily lives. One of the remarkable features of central forces is that they are conservative, i.e. the total energy of a central force system can always be expressed as a gradient of a potential energy function.