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9. An empty freight car of mass 10,000 kg rolls at 2 m/s along a level truck and collides with a loaded car of mass 20,000 kg., standing at rest with brakes released. If the cars couple together, find a. Their speed after the collision b. Find the decrease in kinetic energy after the collision c. With what velocity should the car be rolling toward the empty car in order that both shall be brought to rest by collision?

9. An empty freight car of mass 10,000 kg rolls at 2 m/s along a level truck and collides with a loaded car of mass 20,000 kg., standing at rest with brakes released. If the cars couple together, find a. Their speed after the collision b. Find the decrease in kinetic energy after the collision c. With what velocity should the car be rolling toward the empty car in order that both shall be brought to rest by collision?

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9. An empty freight car of mass 10,000 kg rolls at 2 m/s along a level truck and collides with a loaded car of mass 20,000 kg., standing at rest with brakes released. If the cars couple together, find a. Their speed after the collision b. Find the decrease in kinetic energy after the collision c. With what velocity should the car be rolling toward the empty car in order that both shall be brought to rest by collision?
Transcribed Image Text:9. An empty freight car of mass 10,000 kg rolls at 2 m/s along a level truck and collides with a loaded car of mass 20,000 kg., standing at rest with brakes released. If the cars couple together, find a. Their speed after the collision b. Find the decrease in kinetic energy after the collision c. With what velocity should the car be rolling toward the empty car in order that both shall be brought to rest by collision?
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