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I Why is it one sec?,

  1. Jun 28, 2016 #1
    can you help me with this, please?

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  3. Jun 28, 2016 #2


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    Firstly it doesn't say "one second" it says "per second" which is a rate.

    Momentum = mass * velocity
    Momentum per second would be equal to mass * velocity / time

    Velocity/time = acceleration.

    can you do the rest?
  4. Jun 28, 2016 #3
    Force is the change in momentum per unit time.
    F=ma (m=mass a=acceleration)
    a= (vf-vi)/t
    Replacing a into the force equation:

    F=m (vf-vi)/t
    Which is change in momentum per unit time.
  5. Jun 28, 2016 #4
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