Question

A 120m long train is moving north with 36 km/ hr .A bird is flying towards South at half the speed than the train.what is time taken by bird to cross the train??
​

Answer 1

Answer:

length=120mspeed=10m/s

The relative velocity of train with respect to bird is =(10+5)m/s=15m/s

Since they are opposite to each other then addition will be occurred.

Hence, in aframe of Reference in which bird is at rest the train is moving with velocity =5m/s

The train is 120m long hence time taken for time to pass (from where bird is) end to end is

Speed=timedistancetime=15120=8sec

please mark me branlist please