A 50 g ball is thrown from a window with an initial velocity of 8.0 m/s at an angle of 30 above the horizontal. Using energy methods, determine (a) the kinetic energy of the ball at the top of its flight and (b) its speed when it is 3.0 m below the window. Does the answer to (b) depend on either (c) the mass of the ball or (d) the initial angle?

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