A 42.0 kg projectile is launched horizontally from the top of a cliff, 50 meters above the ground. The projectile’s initial speed is 30 m/s. What is the velocity right before it hits the ground

Velocity of the projectile just before it will hit the surface is 43.4 m/s

Explanation:

In x direction there is no acceleration

so horizontal velocity of the projectile is always constant

So we have

now in Y direction its motion is free fall motion under gravity

so we have

so we have

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.