Question

A railroad car of mass 2.50 ✕ 10^{4} kg moving at 3.40
m/s collides and couples with two coupled railroad cars, each of
the same mass as the single car and moving in the same direction at
1.20 m/s.

(a) What is the speed of the three coupled cars after the collision?

(b) How much kinetic energy is lost in the collision?

Answer #1

A railroad car of mass 3.00 ? 104 kg moving at 3.00
m/s collides and couples with two coupled railroad cars, each of
the same mass as the single car and moving in the same direction at
1.20 m/s.
(a) What is the speed of the three coupled cars after the
collision?
_______ m/s
(b) How much kinetic energy is lost in the collision?
_______ J

A railroad car of mass 2.70 ✕ 104 kg moving at 3.50
m/s collides and couples with two coupled railroad cars, each of
the same mass as the single car and moving in the same direction at
1.20 m/s.
(a) What is the speed of the three coupled cars after the
collision?
m/s
(b) How much kinetic energy is lost in the collision?
J

A railroad car of mass 2.55 ✕ 104 kg moving at 3.25
m/s collides and couples with two coupled railroad cars, each of
the same mass as the single car and moving in the same direction at
1.20 m/s.
(a) What is the speed of the three coupled cars after the
collision?
m/s
(b) How much kinetic energy is lost in the collision?
J

A railroad car of mass 2.90 ? 104 kg moving at 3.05 m/s collides
and couples with two coupled railroad cars, each of the same mass
as the single car and moving in the same direction at 1.20 m/s. (a)
What is the speed of the three coupled cars after the collision?
m/s (b) How much kinetic energy is lost in the collision? J

A railroad car of mass 3.15 ✕ 104 kg moving at 3.10 m/s collides
and couples with two coupled railroad cars, each of the same mass
as the single car and moving in the same direction at 1.20 m/s.
(a) What is the speed of the three coupled cars after the
collision?
____m/s
(b) How much kinetic energy is lost in the collision?
_____J

A railroad car of mass 2.41 104 kg is moving with a speed of
4.10 m/s. It collides and couples with three other coupled railroad
cars, each of the same mass as the single car and moving in the
same direction with an initial speed of 2.05 m/s. (a) What is the
speed of the four cars after the collision? (Round your answer to
at least two decimal places.) (b) How much mechanical energy is
lost in the collision?

A railroad car moving at a speed of 3.50 m/s overtakes, collides
and couples with two coupled railroad cars moving in the same
direction at 1.40 m/s. All cars have a mass of mass 3.3x10^4
kg.
(a) Determine the speed of the three coupled cars after the
collision. (Give your answer to at least 2 decimal places.) m/s
(b) Determine the kinetic energy lost in the collision. J

1. A railroad car of mass 2.40E+4 kg moving with a speed of 3.10
m/s collides and couples with two other coupled railroad cars each
of the same mass that are already moving in the same direction at a
speed of 1.00 m/s.
a. What is the speed (in m/s) of the three coupled cars after
the collision?
b.How much kinetic energy (in J) is lost in the collision?
2.A ring (2 kg, r = 2 m) rotates in a...

A 1.38 × 104 kg railroad car moving at 7.64 m/s to the north
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Four railroad cars, each of mass 2.70 104 kg, are coupled
together and coasting along horizontal tracks at speed vi toward
the south. A very strong but foolish movie actor, riding on the
second car, uncouples the front car and gives it a big push,
increasing its speed to 3.85 m/s southward. The remaining three
cars continue moving south, now at 2.00 m/s.
(a) Find the initial speed of the four cars.
m/s
(b) By how much did the potential...

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