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A 14500 kg railroad car travels alone on a level frictionless track with a constant speed...

A 14500 kg railroad car travels alone on a level frictionless track with a constant speed of 21.0 m/s. A 6000 kg load, initially at rest, is dropped onto the car. What will be the car's new speed?

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Answer #1

Given:

Mass of railroad car,

Initial speed of railroad car,

Mass of load,

Initial speed of load,

==========

When the load is dropped onto the railroad car, momentum is conserved

Initial momentum = Final momentum

ANSWER:

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