A 39.7-g bullet leaves a rifle and embeds itself in a 5.24-kg stationary block of wood. The wood-bullet combination flies away with a velocity of 2.4 m/s. What was the initial velocity of the bullet in m/s?

d.7.5cm is your answer

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

i think it's 35 meters