That's a wonderful problem ! If it was just dry numbers and formulas,
people would come back and ask "How can this be used in the real
world ?" Well, now you know !
There's a bit of a problem with the problem ... the quantity of work.
' k ' doesn't look like any usual unit of work. So I'll have to make up
a unit of work, and then solve the problem that I made up.
I'm going to ignore the little ' k ', and assume that the 2,500 is the
normal metric unit of work ... "joules".
Power = (work) / (time)
= (2,500 joules) / (5 sec)
= 500 joule/sec = 500 watts .
There's your answer. I'm pleased to have been involved
in saving our planet from immediate destruction, and I like
your teacher.