A very long train is rolling at 4 m/s along a straight track. An observer is standing on the ground very dangerously close to the train as moves past notices a person standing on top of a car. When the person on the car is 300 m from the observer, the person begins running toward the observer at 6 m/s. A. Please write down the velocity vector equation for the person with respect to the ground.
B. How much time does the person take to reach the observer?

A.

B.  t = 50 s

Explanation:

A. The vectorial equation of the person who is getting closer to the other person is:

r: position vector

v: speed vector = 6m/s i  (if you consider the motion as a horizontal motion)

Then, you replace and obtain:

B. The time is:

d: distance to the observer = 300m

v: speed of the person on the car = 6.00 m/s

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

answer; how far out of place which the object finished relative to the starting location;