Question

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

Answer 1

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.

Answer 2

what are you trying to find?

Answer 3

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

Answer 4

Thanks again! You're like a physics ninja. ^^

Answer 5

ur welcome @ChemicallyWrit happy to help u :)