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cmsoccer21
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Homework Statement
A rock is thrown horizontally from a cliff with a speed of 15 m/s. It falls half of the heigh of the cliff in the last three seconds of its fall. What is the total fall time?
Homework Equations
The Kinematic Equations
The Attempt at a Solution
Well here's what I have so far but I don't know what its getting me.
Vi=Initial Velocity
Vo=Halfway Down Cliff Velocity
Vf=Final Velocity
Y=Height of cliff
t=time
Vf+29.4=-9.8t
Y=.5(0+Vo)t
Y=.5(Vo+Vf)3
Y=-4.9t^2
Y=Vo(-88.2)
These were all derived from kinematic equations.