Physics

John exerts constant force of 120 N for 10 s. on a stalled motorcycle. The final velocity is 8 m/s after the force was applied. If original velocity was zero, what is a)change of momentum b) the impulse produced c) magnitude of the mass of motorcycle

a&b) Impulse=deltaP=(120)(8)= 960

c.) how do I solve for magnitude of mass?

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  1. a) No
    true a) the same as b)
    but
    impulse = F dt = delta (mv)
    F dt = 120 N * 10 s = 1200 N s

    The change of momentum is M (final velocity - 0)
    so
    1200 N s = M (8 m/s)
    so
    M = 150 N s^2/m
    which is 150 kg

    note
    N force =Mass (m/s^2)
    so
    N s^2/m = M in kilograms

    8 m =

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    posted by Damon
  2. Thanks for correcting me, I got the values wrong xD

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    posted by Michel
  3. lol Michel working on the same prob. as me.

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