Posted by **vince** on Thursday, December 6, 2012 at 7:54am.

A boy throws a ball at 5.5 m/s at an angle of 25.4° above the horizontal off a cliff which is 70.8 m high. What angle does the velocity of the ball make with the horizontal 0.78 s after the throw? (make the angle positive if the angle is above the horizontal, and negative if it is below the horizontal)

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