scince

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During a rain storm, rain comes straight down with velocity Vi =-15 m/s and hits the roof of a car perpendicularly. The mass of the rain per second that strikes the roof is 0.060 kg every second. Assuming that the rain comes to rest upon strikingthe car ( Vf = 0 m/s), find the average force exerted by rain on the roof during a 3 second time interval.

  • Physical Science/Physics -

    F=Ma

    F=M(∆V/t)

    ∆V=Vf-Vi=-15m/s-0m/s=-15m/s
    t=3s
    m=0.060 kg

    Plug and chug

    F=(0.060 kg)[(-15m/s)/3s]

  • scince -

    The time interval doesn't matter.

    F = (0.060 kg/s)(15 m/s) = 0.90 N

  • scince -

    I think that it would: F=ma, and F=mdV

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