physics

The velocity of a ball changes from ‹ 8, −5, 0 › m/s to ‹ 7.88, −5.28, 0 › m/s in 0.04 s, due to the gravitational attraction of the Earth and to air resistance. The mass of the ball is 140 grams.

I calculated the acceleration and got <-3,-7,0>

what is the equation to find the rate of change of momentum of the ball?

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asked by sam
  1. Force = rate of change of momentum = m a if mass is constant

    (7.88 - 8)/.04 = -3
    (-5.28+5) /.04 = -7
    (0 - 0 ) = 0
    so yes

    m a = .140 (do it in kg) * that a vector

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    posted by Damon
  2. By the way, Newton 2 is
    force = rate of change of momentum
    F = m A is the simple version but will not work if mass is not constant (rocket or special relativity for example)

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    posted by Damon

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