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A ball is thrown upward at an angle 30º to the horizontal and lands on the top edge of a building that is 20 m away and 5m high. How fast was the ball thrown (g = 10m/s2). 

(A) 10 m/s 

(B) 20 m/s 

(C) 40 m/s 

(D) 80 m/s

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Correct option (B) 20 m/s

Explanation:

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