A.25 kg ball initially at rest is hit with a 460 n impact. what is the time of impact for this event if the ball ends up moving 40 m/s

As per Newton's II law we can say

Force applied is rate of change of momentum

here we have

given that

m = 0.25 kg

F = 460 N

now by above equation

so it required 0.022 s of contact time

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.