A40 kilogramstudent runs up a staircase to a floor that is 5.0 meters higher than her starting point in 7.0 seconds. the student's power output is

When she reaches the top, she has more potential energy than she had at the bottom.

         Potential energy = (mass) x (gravity) x (height)

                                     = (40 kg) x (9.8 m/s²) x (5 m)

                                     =    1,960 more joules .

         Power = (energy) / (time)

                     = (1,960 joules) / (7 seconds)

                     =         280 watts

                    (about 0.375 horsepower) 

Total energy = potential energy + kinetic energy 
Here, P.E. = 1200 J
K.E. = 1000 J

Substitute their values, 
E = 1200 + 1000
E = 2200 J

In short, Your Answer would be 2200 Joules

Hope this helps!