February 27, 2017

Homework Help: Physics

Posted by Stuck on Thursday, July 29, 2010 at 8:45pm.

"A workman sitting on top of a roof of a house drops his hammer. The roof is smooth and slopes at an angle of 30.0 degrees to the horizon. It is 32m long and its lowest point is 32m from the ground. How far from the house's wall is the hammer when it hits the ground?" (28m)

I thought I would firstly find the acceleration of the hammer down the roof.

ma = Fgx
a = (9.81)(sin30) = 4.905

Using the acceleration, I found the final velocity at the roof.

Vf^2 = Vi^2 + 2ad
Vf^2 = 0 + 2(4.905)(32)

However, is the initial velocity 0?

After I found Vf, I used that as the initial velocity to find the time it would take for the hammer to fall to the ground, and then used that time to find the horizontal distance. I don't get the answer I even doing this correctly?

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