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Q.

A person A is sitting in one train while another person B is in the second train. The trains are moving with velocities 60 m/s and 40 m/s, respectively, in the same direction.Then the velocity of B relative to A will be

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a

100 m/s in the direction of trains

b

20 m/s in the direction of trains

c

100 m/s in the direction opposite to that of trains

d

20 m/s in the direction opposite to that of the trains

answer is D.

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Detailed Solution

v→A=60i^,v→B=40i^v→B/A=v→B−v→A=40i^−60i^=−20i^ So direction is opposite to that of trains.

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