1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

# A 120 m long train is moving towards west at a speed of 10ms−1. A small bird flying towards east at a speed of 5ms−1 crosses the train. What is time taken by the bird to cross the train?

A
4 s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
8 s
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
12 s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
24 s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

## The correct option is B 8 slength=120mspeed=10m/sThe relative velocity of train with respect to bird is =(10+5)m/s=15m/sSince 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/sThe train is 120m long hence time taken for time to pass (from where bird is) end to end isSpeed=distancetimetime=12015=8sec

Suggest Corrections
0
Join BYJU'S Learning Program
Related Videos
Relative Motion
PHYSICS
Watch in App
Explore more
Join BYJU'S Learning Program