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Standard IX

Physics

Velocity(Speed with Direction)

A person 𝐴 i...

Question

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

100 m / s

in the direction opposite to that of trains

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20 m / s

in the direction opposite to that of the train

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100 m / s

in the direction of trains

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20 m / s

in the direction of trains

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Solution

The correct option is B $20 m / s$ in the direction opposite to that of the train
Assuming the direction of moving train is $+ x$ .
Given, ${\to v}_{A} = 60^i m / s$
${\to v}_{B} = 40^i m / s$
${\to v}_{B A} = {\to v}_{B} - {\to v}_{A}$
${\to v}_{B A} = 40^i - 60^i$
${\to v}_{B A} = 20 (-^i)$

Final Answer: (d)

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Velocity(Speed with Direction)

Standard IX Physics

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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

The correct option is B 20 m/s in the direction opposite to that of the trainAssuming the direction of moving train is +x. Given, →vA=60 ^i m/s →vB=40 ^i m/s →vBA=→vB−→vA →vBA=40^i−60^i →vBA=20(−^i) Final Answer: (d)

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