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Annieb

  • 3 years ago

A 2.5 kg ball is dropped onto a concrete floor. It strikes the floor with a momentum of 20 kg • m/s and bounces away from the floor with a momentum of 16 kg • m/s. What is the change of momentum of the ball? (A) 4 kg • m/s (B) 8 kg • m/s (C) 32 kg • m/s (D) 36 kg • m/s (E) 40 kg • m/s A 2.5 kg ball is dropped onto a concrete floor. It strikes the floor with a momentum of 20 kg • m/s and bounces away from the floor with a momentum of 16 kg • m/s. What is the change of momentum of the ball? (A) 4 kg • m/s (B) 8 kg • m/s (C) 32 kg • m/s (D) 36 kg • m/s (E) 40 kg • m/s @Physics

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  1. sauravshakya
    • 3 years ago
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    (A) 4 kg • m/s

  2. kartiksriramk
    • 3 years ago
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    (D) 36 Kg m/s

  3. akhil009
    • 3 years ago
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    ans is 36

  4. Yahoo!
    • 3 years ago
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    (D) 36 Kg m/s

  5. sauravshakya
    • 3 years ago
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    change in momentum = finial momentum - intitial momentum

  6. Yahoo!
    • 3 years ago
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    since it acts in opp direction

  7. akhil009
    • 3 years ago
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    bcuz momentum is vector quantity u can not simply subtract them you have to be care ful with their vector directions|dw:1344183447716:dw|

  8. sauravshakya
    • 3 years ago
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    I think question must specify that one is 20 and other is -16 since momentum is a vector quantity

  9. akhil009
    • 3 years ago
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    |dw:1344183608654:dw|

  10. akhil009
    • 3 years ago
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    @sauravshakya as he said ball is dropped and bounce so you can assume directions

  11. sauravshakya
    • 3 years ago
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    oh ya....

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