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September 1, 2015

Homework Help: physics

Posted by projectile motion on Monday, September 14, 2009 at 10:40pm.

A boy sitting on the edge of a vertical cliff fires a rock with a slingshot at a velocity of 16.45758956 m/s and an angle of 59.78 degrees above the horizontal.
The rock lands in a lake at the base of the cliff, a horizontal distance of 89.67 meters beyond the base of the cliff. How high is the cliff in meters?

i got an answer of y=-420.2599461m
is this right??

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