Question

Why it's dangerous to jump from moving train as train is always at rest with respect to me???

Answer 1

when you jump from a moving train your body is in inertia with respect to train and in motion with respect to ground so when you jump from a train your body will be at the speed of the train so when you collide with ground you will feel a sudden impact of ground which can break your leg also but while you are in the stop the train you are at rest with respect to ground so you will feel less impact and it will not hurt you
this answer can also be example of relative motion

Answer 2

Train is at rest from the viewers position not from the position where the person is in the train..

It is Very dangerous.. to jump from moving train as The impact of The force On the person who is Leaving from the Moving train might kill or Have a harmful effect on him!