Question

If a train running at a speed of 150 km/h if you remove one by one all the coaches then what is the speed of engine?​

Answer 1

Answer:

What you wish to know is what will be the speed of the system. System here means the engine + bogies, wherein the number of bogies is decreasing after every decision of the person performing the experiment.

If one bogie is detached from the system, then there will be a quantum decrease of frictional force that the system is undergoing with corresponding increase in the speed of the system. that quantum of frictional force due to 1 bogie will depend only on the Normal force that is being experienced by the bogie and the coefficient of the kinetic friction. It will not depend on the speed of the system.

The coefficient of kinetic friction for steel is around 0.09–0.6. The acceleration produced by the engine will be needed and the information regarding the weight of the body will also be needed.

Explanation: