Question

what is the power output for a 60 kg woman who runs up a 3 m high flight of stairs in 3.5 s , starting fro rest but having a final speed of 2 m/s​

Answer 1

Answer:7.77 P=0.5(60.0 kg)(2.00 m/s)2+(60.0 kg)(9.80 m/s2)(3.00 m)3.50 s=120 J+1764 J3.50 s=538 W. The woman does 1764 J of work to move up the stairs compared with only 120 J to increase her kinetic energy; thus, most of her power output is required for climbing rather than accelerating.