Class 11 NEET Physics Motion in a Plane Questions

Choose the positive direction of x -axis to be from south to north. Then
velocity of train vT=+10ms−1
velocity of parrot vP=−5ms−1
Relative velocity of parrot with respect to train=vP−vT=(−5ms−1) −(+10ms−1)
=−15ms−1
i.e. parrot appears to move with a speed of 15ms−1 from north to south
∴ Time taken by parrot to cross the train=

150m

15ms−1

=10s