A missile with a mass of 
moving at a speed of 
in a horizontal direction hits a fixed wooden board whose thickness d is 
. The missile exits on the other side of the board at a speed of 
. Assuming the board does not move during the collision.
How much work does the board resistance do when stopping the missile?
What is the average force of the board on the missile?
What must be the least thickness of the board so that the missile does not pierce it?
A missile projected at a board
.
.
.
