Question

Asked Dec 2, 2019

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A 7100-kg railroad car travels alone on a level frictionless track with a constant speed of 16.0 m/s . A 2650-kg load, initially at rest, is dropped onto the car.

What will be the car's new speed?

Express your answer to three significant figures and include the appropriate units.

Step 1

**Given information:**

Mass of the rail road car (m_{r}) = 7100 kg

Initial speed of the rail road car (u_{r}) = 16 m/s

Mass of the load (m_{r}) = 2650 kg

Initial speed of the load (u_{l}) = 0 m/s

Let “v” be the final velocity of the car.

Step 2

According to law of conservation of momentum, the initial and fin...

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