posted by Sarah
A bullet is fired horizontally and penetrates into a block of wood. The block and bullet then move together after impact. Explain the total linear momentum and total kinetic energy of the system before and after the collision
mass bullet * u + mass wood * 0
= (mass bullet + mass wood) * v
(1/2)mass bullet * u^2 + 0
= (1/2)(mass bullet+mass wood) * v^2
The Ke after will be less :) Energy was converted to heat while slowing the bullet.