Why does a person sitting in one train think that the other train is at rest, when both trains are moving on parallel tracks with the same speed and in the same direction?

This is because the relative velocity of the train in which the person is sitting w.r.t. the other train is zero. For example, let the velocity of A train = 60km/ hr due east Velocity of B train = 60km/ hr due east Relative velocity of A train w.r.t. B train = 60 - 60 = 0

Why does a person sitting in one train think that the other train…

For a wire of a material radius 0.5 mm , Young's modulus of elasticity of the material of the wire $2 \times 10^{11} N / m ^2$ and if strain of the wire cannot be more than $10^{-3}$ then how much weight can be suspended from the wire?

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For what condition, an object could be considered as a point object? Describe in brief.

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Theory and experiment go hand$-$in$-$hand in Physics. Give examples in support of this view.

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