question_answer

  (a) State and define SI unit of power. (b) A person carrying 10 bricks each of mass 2.5 kg on his head moves to a height 20 m in 50 s. Calculate power spent in carrying bricks of the person,

Answer:

   (a) Power The rate of doing work is called power. Its SI unit is watt.                         (b) Mass of one brick = 2.5 kg Mass of 10 bricks = 2.5 x 10 = 25 kg