I'm having trouble finding horizontal force. More info in comment.

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I'm having trouble finding horizontal force. More info in comment.

Physics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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A 50.0 kg sprinter, starting from rest, runs 55.0m in 9.80s at constant acceleration. I figured I'd have to use a kinematic equation for this: 55=0+0(9.8)+a(9.8^2) And then I could multiply by the mass, and I'd have my force. But this doesn't seem to be working. It would help, I suppose, if I could figure out what all the forces are.
what are you trying to find?
A 50.0 kg sprinter, starting from rest, runs 55.0m in 9.80s at constant acceleration. I figured I'd have to use a kinematic equation for this: SO to finding horizontal force: s = vo t + 0.5 a t^2 s = 0 + 0.5 a t^2 s = 0.5 a t^2 a = s/(0.5 t^2) a = 55 / (0.5 x (9.8^2)) a = 55/48.02 a =1.145 m/s^2 F = ma F = 50 kg x 1.145 m/s^2 F = 57.267 N

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Thanks again! You're like a physics ninja. ^^
ur welcome @ChemicallyWrit happy to help u :)

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