Work Power Engergy Thrown Toilet Roll Problem

[jojo711]

Homework Statement

A pure silver Lions fan throws a roll of toilet paper at 11.0 m/s from her seat at Ford's Field during a recent game. How fast is the 0.4 kg roll going when it strikes an opposition player 17.0 m below?

Homework Equations

1/2mv^2 = mgh <-- i think.

The Attempt at a Solution

I did 1/2mv^2 = mgh and got something like 18.25 and then got totally confused and did not know how to do it. Please help. I am totally lost. thanks please answer in the next 20 mintues and you will receive lots of love. Thanks.

 

[Delphi51]

Yes, definitely an energy question! But I think you have oversimplified a bit. Wouldn't it be
Initial KE + initial PE = final KE

 

[jojo711]

I did:
mgh+1/2mv^2
and got an answer and I don't know what to do from there.

 

[Delphi51]

Initial KE + initial PE = final KE
mgh+1/2mv^2 = 1/2mV^2
Fill in the numbers.

 

[jetwaterluffy]

Which direction are they throwing the roll in?

 

[Delphi51]

We can find the magnitude of the velocity from the final KE. But not the direction because the initial direction isn't given.