Calculating Speed of Lead Bullet on Steel Sheet

[joyana32]

Homework Statement

A lead bullet at 320K is stopped by a sheet of steel so that it reaches its melting point of 600K and completely melts If 80% of the k.e of the bullet is converted into internal energy calculate the speed with which the bullet hits the stee sheet.

Homework Equations

Specific heat capacity of lead = 0.12kJ/kg K
Specific latent heat of fusion is 21kJ/kg

The Attempt at a Solution

i have just started this class so i am a newbie to all of this i tired EK=1/2mv^2 but I am having trouble with it

 

[Chopin]

This doesn't belong in the Advanced Physics forum--the Introductory forum would be more appropriate.

Having said that, a good start would be to calculate how much energy it would take to melt the bullet. It doesn't tell you the bullet's mass, so just call it 'm' for now, and try to calculate the value in terms of that.