Question

Boy of mass 40 kg climb up the stairs and reach the roof at the height of 10 meters with a weight of 10 kg in his hand in 1 min . how much power spend by the boy​

Answer 1

Answer:power=force by velocity

         velocity =height/time

                        =10/60 =0.16

        and force=weight =mass by gravity                        

        therefore weight =40 by 10 =50N

  THEREFORE   POWER= 50 by 0.16

                                         =8 watt

Explanation: