A 53 g ball is thrown from a window with an initial velocity of 8.0 m/s at an angle of 25 ° 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 3.2 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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