Homework Help: Physics - urgent ; test Monday

Posted by Li on Saturday, February 21, 2009 at 8:10pm.

Divers entertain tourists in Punta Cana by diving froma cliff 36 meters above water. Determine the landing speed; ignore air resistance and assume the object starts from rest. I'm supposed to be using kinematics formulas.

I tried using d=V(i)t+1/2at^2 and then plussing the valued into the kinematics formula to solve for time and then using V(f)=V(i)+at. I got a ridiculous nswer, so I'm pretty sure I'm not doing this right. Please, please help me.

Physics - urgent ; test Monday - Damon, Saturday, February 21, 2009 at 8:14pm
I suspect that Vi should be assumed zero.
36 = (1/2)(9.8)t^2 = 4.9 t^2
t = 2.71 seconds
V = a t = 9.8*2.71 = 26.6 m/s
Physics - urgent ; test Monday - Li, Saturday, February 21, 2009 at 8:29pm
oh, ok, I see; I was making this waaay too comlicated...
Thank you! :)

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