# In calm weather, raindrops fall vertically relative to the ground. The train speed is 54 km / h.

In calm weather, raindrops fall vertically relative to the ground. The train speed is 54 km / h. What is the speed of the drops relative to the train?

To solve the problem, you need to know the definition of “motion relativity”.

Mechanical movement is relative – to describe
movement, it is necessary to indicate with respect to which body it is being viewed.

We can say that the train moves along the x-axis, and the raindrops move along the y-axis. From the condition, nothing acts on the drops, i.e. raindrops fall perpendicular to the train, which means their speed is 0, and if the wind was blowing in the opposite mood, then the raindrops would move with negative speed RELATIVE to the train.

Answer: on a windless day, raindrops do not change their position relative to the train, i.e. they have no speed.

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