A 5000-kg freight car collides with a 10,000-kg freight car at rest. They couple upon collision and move at 2 m/s. What was the initial speed of the 5000-kg car?
A) 4 m/s
B) 5 m/s
C) 6 m/s
D) 8 m/s
E) none of the above
Answer: C
You might also like to view...
The most metal-rich terrestrial planet is
A) Mercury. B) Venus. C) Earth. D) the Moon. E) Mars.
The granules in the photosphere are about as big as Texas, or around 1,000 km across
Indicate whether the statement is true or false
The property of objects to resist a change in motion is called
1) friction, 2) velocity, 3) inertia, 4) acceleration, 5) gravity, and it is measured by its 6) speed. 7) velocity. 8) mass. 9) all of these.
Graphical Addition: If 
+ 
= 
and their magnitudes are given by A + B = C, then the vectors 
and 
are oriented
A. perpendicular relative to one other. B. parallel to each other (in the same direction). C. antiparallel to each other (in opposite directions). D. It is impossible to know from the given information.