Solved: A 12,600-kg railroad car travels alone on a level

Chapter 1, Problem 7P

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QUESTION:

Problem 7P

A 12,600-kg railroad car travels alone on a level frictionless track with a constant speed of 18.0 m/s. A 5350-kg load, initially at rest, is dropped onto the car. What will be the car’s new speed?

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QUESTION:

Problem 7P

A 12,600-kg railroad car travels alone on a level frictionless track with a constant speed of 18.0 m/s. A 5350-kg load, initially at rest, is dropped onto the car. What will be the car’s new speed?

ANSWER:

Step 1 of 2

From the conservation of momentum, the initial momentum of a body can be equated to final momentum of the same body. The momentum can be expressed as,

                                                               

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