Question

calculate the power developed by a 110 Kg man climbing up a vertical stairway at the rate of 2.0m/s . take g = 9.8 m/s^2

Answer 1

given , m = 110 Kg
          g = 9.8 m/s
          distance covered in 1 sec ( Let it be 'a' ). = 2.0m
          power ( p ) = ?

                    Let W = mga
    P = W/T 
    P = mga / t
       =  110 * 9.8 * 2 / 1 
       = 2156 watt  answer........
   

Answer 2

mass = 110kg
g = 9.8 m/s²
velocity, v = 2m/s

weight force , F = mg = 110×9.8 = 1078N
Power = Force × velocity = 1078×2 = 2156 Watt

So power developed is 2156W.