Question

a bird is flying towards north with a velocity 40 km/hr and a train is moving with a velocity 40 km/hr toward east .what is the velocity of bird noted by man on train

Answer 1

He will see the bird flying 40kmph north and 40kmph West
Adding them with vector addition
He will observe bird moving with 40√2kmph in North-west direction

Answer 2

He will see the bird flying 40kmph north and 40kmph West

Adding them with vector addition

He will observe bird moving with 40√2kmph in North-west direction

hope it helps