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abdul_shabeer

  • 4 years ago

A body of mass M collides against a wall with velocity V and rebounds with the same speed. It's change of momentum is

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  1. Aadarsh
    • 4 years ago
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    No Change as such

  2. hkaur
    • 4 years ago
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    momentum= mass*velocity both remain same after collision so no change in momentum.

  3. abdul_shabeer
    • 4 years ago
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    Answer is given as 2MV

  4. Aadarsh
    • 4 years ago
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    But how? Are we to add both the momenta?

  5. salini
    • 4 years ago
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    adarsh see the direction change as well first it is +v next it is -v

  6. Aadarsh
    • 4 years ago
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    Okay. yeah, got it. First, Its MV. Second is -MV. Subtracting, we get 2MV.

  7. abdul_shabeer
    • 4 years ago
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    By subtracting how we get 2MV

  8. Aadarsh
    • 4 years ago
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    But I don't understand why the sign is +ive in first case and -ive in second case.

  9. Aadarsh
    • 4 years ago
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    See, MV - ( - MV) = MV + MV = 2MV(Simple integer addition)

  10. Aadarsh
    • 4 years ago
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    Can anyone say about the signs?

  11. salini
    • 4 years ago
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    |dw:1329838538143:dw|because we shud maintain a standard sign system like think this way

  12. Aadarsh
    • 4 years ago
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    So, in all physics problems requiring direction, we need to follow Cartesian System, rite?

  13. salini
    • 4 years ago
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    yeah there is more than that for that u need to come to 11th for now understand that when it is a 1-dimensuional(straight line motion) follow the co-ordinate axes

  14. Aadarsh
    • 4 years ago
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    Ok. Thanks.

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