If a person A is moving with velocity 2 km/h, person B is moving
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    Subject
    Mathematics

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    JEE Class 12

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    JEE Mathematics Solved Question Paper 2011

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    21.

    If a person A is moving with velocity 2 km/h, person B is moving with velocity 3 km/h and the angle between the direction of movements of A and B is 60°, then the velocity of A relative to B in the direction of A is

    • 7

    • 19

    C.

    7

    ∴ Relative velocity = u2 + v2 - 2uvcosα           = 22 + 32 - 2 × 2 × 3cos60°          = 13 - 12 × 12 = 7

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    NCERT Solutions
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