Given height find how fast its moving

[kmiller]

given height find how fast its moving...

Homework Statement

Seagulls are often observed dropping clams and other shellfish from a height to the rocks below, as a means of opening the shells. If a seagull drops a shell from rest at a height of 6 m, how fast is the shell moving when it hits the rocks?
find m/s

The Attempt at a Solution

6m/9.8=58.8 wrong
i can't figure it out help please

 

[Mattowander]

What equation did you attempt to use?

Are you not aware of the kinematics equations?

 

[kmiller]

I am using motion equations, Vf=Vi+at

 

[Mattowander]

But you're not given the time. You're only given the initial velocity, the distance, and you know the acceleration due to gravity. That is not the correct formula to use. What other formulas are there for kinematics?

 

[kmiller]

VF2=Vi2+2a+(delta)

or

Xf=Xi=Vit=.5at2

 

[Mattowander]

The first equation is correct.

Vf^2 = Vo^2 + 2ad

You have to use the equation that has the terms that you're given. You're not given time and so you can't use any other equation in this situation. Now are you able to solve the problem?

 

[kmiller]

Yes if figured it out thanks alot
the answer was 10.844 m/s