Question

Dogs pull a sled 355 meters using 39900 Joules of energy. Calculate average force.

Answer 1

By definition the work is:

$$A = Fs$$

where $F$ is the average force and $s$ is distance over which the force was acting. If $s = 355m$ and $A = 39900J$, then the average force is:

$$F = \dfrac{A}{s} = \dfrac{39900J}{355m} \approx 112.4N$$

Answer. 112.4 N.