[" 3.A boy having mass "40kg" is climbing an upstairs having "20" steps and each step is of "25],[cm" Calculate work done by him in climbing the stairs."]

A man whose mass is 50 kg climbs up 30 steps of a stair in 30 s. If each step is 20 cm high, calculate the power used in climbing stairs.

A boy of mass 40 kg climbs vertically upwards on a coconut tree to a height of 10m. Calculate the work done by the boy.

A boy of mass 40 kg climbs a staircase of 30 steps, each of 0.2 m height, in 30 s. Calculate power. (g=9.8ms^(-2))

A boy weighing 40 kg climbs up a vertical height of 200 m. calculate the amount of work done by him. How much potential, energy does the pain?

A person of mass 50 kg carrying a box walks up a staircase. The height and width of each step is 20 cm and 15 cm. If the work done in walking up 50 steps is 7840j, the mass of the box is,

A 50kg man with 20 kg load on his head climbs up 20 steps of 0.25 m height each. The work done in climbing is