Question

two parallel rail tracks Run north south. Train A moves north with a speed of 54 kilometre per hour and train B moves south with a speed of 90 kilometre per hour. what is the 1)Velocity of B with respect to A.
2)Velocity of ground with respect to B.
3)Velocity of a monkey running on the roof of train A against its motion
( with a velocity of 18km/hr) with respect to train A as observed by a man standing on the ground.​

Answer 1

Answer:

Velocity of Monkey with respect to ground is – VM

Velocity of Monkey with respect to train A is - VA

Relative velocity of Monkey with respect to train A - VMA

VMA = VM - VA

Given - Velocity of Monkey with respect to train A = VA = 54 Km/h = 54 x

5/18 m/s = 15m/s

And Relative velocity of Monkey with respect to train A = VMA = -18 Km/h = -18 x 5/18 = -5m/s

(as monkey running

against the motion)

Therefore,

VMA = VM - VA

-5 m/s = VM – 15 m/s

VM = -5 m/s + 15 m/s

VM = 10 m/s

Answer - The velocity of a monkey running on roof

of a train A against its motion is 10 m/s