Question1
A jet plane lands with a velocity of +112 m/s and can accelerate at an utmost rate of -5.50 m/s^2 as it comes to rest. From the instant it touches the runway, what is the least time needed before it can come to rest?
Could this plane land on a small tropical island airport where the runway is .8000 km long?
What is the smallest distance required to stop the plane?
Question2
A certain elevator cab has a total run of 210 m and an utmost speed is 321 m/min, and it accelerates from rest and then back to rest at 1.10 m/s2.
(a) How far does the cab move while accelerating to full speed from rest?
(b) How long does it take to make the nonstop 210 m run, starting and ending at rest?
Question3
The barrel of a rifle has a length of 0.898 m. A bullet leaves the muzzle of a rifle with a speed of 616 m/s.
What is an acceleration of the bullet while in the barrel? A bullet in a rifle barrel does not have constant acceleration, but constant acceleration is to be supposed for this problem.
Reply in units of m/s2.