Question

One horsepower (1 hp) is the unit of power based on the work that a horse can do in one second. This is defined, in English units, as a force of 550 lb that can move an object 1 foot in 1 s. In SI, 1 hp equals 745.7 W, or 745.7 J of work delivered in 1 s. Suppose you have a horse that delivers 745.7 W of power, but that it does the work in only 0.55 s. How much work has this horse done?

Answer 1

Power is defined as rate of work done which means it is work done in 1 second of time

Now it is given that we have a horse that will give power 745.7 W

So it will do work of 745.7 J in  1 second of time

now if we wish to find the work done by horse in 0.55 s

so we can say

$W = Power \times time$

$W = 745.7 \times 0.55$

$W = 410.14 J$

So it will do total work of 410.14 J in 0.55 s of time