Homework Help: phisics

Posted by Elise on Sunday, December 19, 2010 at 4:44pm.

A ball is thrown with a speed of 20 m/sec at an angle of 60 degrees below the horizontal from a bridge whisch is 30 m above the water. Where does the ball hit the water? How long is it in the air?

phisics - bobpursley, Sunday, December 19, 2010 at 4:49pm
Learn how to spell physics. I am reminded of the child who keep mispelling her last name.

initial vertical speed:
-20sin60

hf=hi+Viv*t-4.9t^2
0=30-20sin60 * t - 4.9t^2
solve for t. Notice you will have to use the quadratic equation.

distance= 20cos60 *t

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