well, the total slack is 16*4cm = 64cm
so, as the slack is reduced by 25 cm/s, and time = distance/speed, ...
The length of each car does not matter, unless there is some stretch constant telling how long it takes for the pulse to move the length of the car.
A 17-car train standing on the siding is started
in motion by the train’s engine. 4 cm slack is
between each of the cars, which are 9 m long.
The engine is tightly connected to the first car
and moves at a constant speed of 25 cm/s.
How much time is required for the pulse to
travel the length of the train?
1 answer
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