- #1
Lis277
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Homework Statement
The power driving the railroad engine is switched off. The engine stops, from its speed of 16m/s^-1, without braking in a distance of 1.1km. A student hypothesis that the horizontal resistive force is constant. Based on the hypothesis, calculate the mass of the railway engine.
Homework Equations
Teacher didn't provide any relevant equations but i assume F=ma and vf^2-vi^2=2ad are important
The Attempt at a Solution
First i tried to find
acceleration
vf^2-vi^2=2ad
vf=0
vi=16
a=?
d=1.1
(0)^2-(16)^2=2(1.1)a
-256=2.2a
-116.36=a
I think the next step would be to find net force to plug all my variables into F=ma to find mass. I know net force is the total force on an object but I'm not sure how to find net force from my given variables.