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A ball is thrown upward from a platform 5.6 m high with a speed of 18 m/s at an angle of 35 o from the horizontal. What is the magnitude of its velocity when it hits the ground?

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Use energy considerations:

Kineticinitial+ potentialinitial=kinetic energyfinal

1/2 m 18^2+mg*5.6=1/2 m vf^2

solve for vfinal

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