- #1
Sealy
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Homework Statement
A ball is projected horizontally from the edge of a table that is 0.443 m high, and it strikes the floor at a point 1.84 m from the base of the table.
The acceleration of gravity is 9.8 m/s^2
Homework Equations
a) What is the initial speed of the ball? Answer in units of m/s
b) How high is the ball above the floor when its velocity vector makes a -18.9486 degree angle with the horizontal? Answer in units of m.
The Attempt at a Solution
a) i got it right, and the answer is 6.13
b) this is what i have trouble on. I started by finding Vy using (6.13)(tan -18.9486)=Vy and i got: Vy=-2.10 I then used the formula Vf = Vo + a*t to get time. I got t=-.21 s
Next i used d = Vot + 0.5a*t^2 to solve for distance and i got d= .22
Finally i did 0.443-0.22 and i got 0.22. The answer is not .22.
I need help please. What did i do wrong?