Question

Two parallel rail tracks run north-south. Train A moves north with a speed of 15 m/s and train B moves south with a speed of 25 m/s.
a) What is the velocity of B with respect to A?
b) What is the velocity of the ground with respect to B?
c) What is the velocity of a monkey running on the roof of the train A against its motion (with a velocity of 5 m/s with respect to the train A) as observed by a man standing on the ground?​

Answer 1

Answer:

v

BA

=

v

B

-

v

A

Hence, velocity of train B w.r.t train A is 144 km/h toward south.

b. Velocity of ground w.r.t. B

v

g,B

=v

g

−v

B

= 0 - 90$$

v

g,B

= -90 km/h

Hence, velocity of ground w.r.t train B is 90 km/h towards north.

c.

v

m,g

=

v

m,A

+

v

Ag

= 18 - 54 = -36 km/h

Hence, velocity of monkey will be 36 km/h toward north.

Explanation:

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