How Much Ice Melts When a Bullet Penetrates It?

[BuBbLeS01]

Please help...How much ice melts?

Homework Statement

A 70 gram bullet traveling at 250 m/s penetrates a block of ice at 0 degrees Celsius and comes to rest within the ice. Assuming that the temperature of the bullet doesn't change appreciably, how much ice is melted as a result of the collision?

The Attempt at a Solution

I don't know where to start on this?

 

[G01]

Questions to get you started:

How much energy is needed to melt a gram of ice?

How much energy does the bullet give to the block of ice when it slows down?