You (65 kg) are standing in an elevator traveling upward that passes the 3rd floor at 3.5 m/s and then passes the 4th floor at 4.5 m/s one second later. Find the normal force exerted on your feet by the elevator while it is passing between these floors.

I got 6565 N, because acceleration is 1, Fnet = ma which is 65, and WE1 is -6500 N, but that isn't the right answer.

Thanks so much for any help you can give me!

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  1. The floor must accelerate the person as well as support his or her weight. Acceleration is upward at 1.0 m/s^2

    I don't understand what your "WE1" is or how you came up with it.

    F(on feet) = M*(g + a)
    = 65*(9.8 + 1.0) = 702 N

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