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    Average force on a 0.47 kg ball bouncing from 34 m to 24 m

    Homework Statement After falling from rest from a height of 34 m, a 0.47 kg ball rebounds upward, reaching a height of 24 m. If the contact between ball and ground lasted 1.8 ms, what average force was exerted on the ball? Homework Equations vf^2=2gh vf=sqrt 2gh...