A boy weighing 350 N runs up a flight of 30 steps, each 20 cm high in

1.	A boy weighing 350 N runs up a flight of 30 steps, each 20 cm high in 1 minute, Calculate:(i) the work done and(ii) power spent.
Answer» Total distance covered in 30 steps , S= 30 x 20 cm = 600 cm = 6 m Work done by the boy in climbing= Force x distance moved in direction of force Work, W= F x S= 350 x 6 =2100 J Power developed = work done/time taken = 2100J/60s = 35W

A boy weighing 350 N runs up a flight of 30 steps, each 20 cm high in 1 minute, Calculate:(i) the work done and(ii) power spent.

Answer»

Total distance covered in 30 steps , S= 30 x 20 cm = 600 cm = 6 m

Work done by the boy in climbing= Force x distance moved in direction of force

Work, W= F x S= 350 x 6 =2100 J

Power developed = work done/time taken = 2100J/60s = 35W