Homework Help: Physics

Posted by Anonymous on Saturday, September 17, 2011 at 12:43pm.

A stone is thrown from a cliff top with a vertical velocity of 50 m/s and horizontal velocity of 20 m/s.

What is its resultant velocity?
At what angle above the horizontal is it thrown?

Physics - Henry, Sunday, September 18, 2011 at 6:41pm
Xo = hor. = 20m/s.
Yo = ver. = 50m/s.

tanA = Yo / Xo = 50 / 20 = 2.5,
a = 68.2 Deg.

Vo = Xo / cosA = 20 / cos68.2 = 53.85m/s @ 68.2 deg.

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