Question

A passenger in a moving train tosses a coin which falls behind him. State the type of motion of the train giving reasons for your answer.

Answer 1

The train is in accelerating motion, means the train is speeding up..
As we know the term law of inertia of rest, that is , any body which is in rest, and when a sudden force is applied, it tends to be in rest position, so the object inside the body falls back or behind. 
It is falls behind due to inertia of rest.

Answer 2

the train is in accelerated motion this is the reason that's why the coin will fall back to passenger. As train will move forward but coin will remain there.