Question

A railroad car of mass 3.45 x 10^{4} kg is traveling
east at 5.50 m/s and collides with a railroad car of mass 4.21 x
10^{4} kg traveling west 1.50 m/s. Find the velocity (in
m/s) of the railroad cars that become coupled after the collision.
Assume east is the positive direction

Answer #1

Assuming east as the positive x-direction

The initial momentum of the system is

Now, when both the cars get coupled after the collision, the momentum of the system is

Applying conservation of momentum

**So, after the collision, the cars move to the east with
a velocity of 1.65 m/s.**

A railroad car of mass 22 500 kg is traveling east 5.50 m/s and
collides with a railroad car of mass 30 000 kg traveling west 1.50
m/s. Find the velocity of the railroad cars that become coupled
after the collision.

A railroad car of mass 2.50 ✕ 104 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?

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

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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

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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

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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?
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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

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