Question 1132126

the dog's initial speed is {{{1(m/s)}}}

 the dog speeds up by {{{1(m/s)}}} every time it heats the can hit a rail

The US standard railroad gauge (distance between the rails) is {{{4 }}} feet={{{1.2192m}}}
 assuming the can hits all the rails, the number of the rails is:
{{{5000m/1.2192m=4101.049868766404=4101}}}

assuming the can hits all the rails, it will be {{{4101}}} times

so, dog will increase speed {{{4101}}} times by {{{1(m/s)}}}


 the dog's speed at the end of the {{{5km}}} is initial speed plus  increase:

{{{s=1(m/s)+4101(m/s)}}}

{{{s=4102(m/s)}}}