How many 2.5 kg bricks can man carry up a staircase 3.6 m high in one hour if he works at an average rate of 9.8 watt?

How many 2.5 kg bricks can man carry up a staircase 3.6 m high in one

1.	How many 2.5 kg bricks can man carry up a staircase 3.6 m high in one hour if he works at an average rate of 9.8 watt?
Answer» 800 200 600 400 SOLUTION :Work DONE by man in one hour= power `XX` time `= 9.8 xx 1 xx 60 xx 60 J` Work done by man in raising one brick = `mgh = 2.5 xx 9.8 xx 3.6 J` . Number of bricks , `N = (9.8 xx 1 xx 60 xx 60)/(2.5 xx 9.8 xx 3.6) = 400`.