Compute all parts of following problem given below:
Problem: A rifle is aimed horizontally at a target 100 m away. When the fired bullet strikes the target it is 1.5 cm below the aim point.
Part I: What was the bullet's flight time?
Part II: What was the bullet's velocity as it left the rifle barrel?
Part III: What was the bullet's velocity just before it struck the target?
Please show all work and steps I am really trying to learn this for my exam.