A man `M_(1)` of mass `80 kg` runs up a staircase in `15 s`. Another man `M_(2)` also of mass `80 kg` runs up the same staircase in `20 s`. The ratio of the power development by then will be:

A man M_(1) of mass 80 kg runs up a staircase in 15 s. Another man M_(2) also of mass 80 kg runs up the stair case in 20 s. The ratio of the power developed by them will be:

A boy ''A'' of mass 50kg climbs up a stair case in 10s. Another boy ''B'' of mass 60kg climbs up a same staircase in 15s. The ratio of their power developed by the boys ''A'' and ''B'' is

A 60 kg man runs up a staircase in 12 seconds while 50 kg man runs up the same staircase in 11, seconds, the ratio of the rate of doing their work is

A 60 kg man runs up a staircase in 12 seconds while 50 kg man runs up the same staircase in 11, seconds, the ratio of the rate of doing their work is

A man of mass 50 kg clikmbs up 20 steps of a staircase in 5s . Each step is 30 cm high. Find the power applied by the man .

A boy of mass 50 kg runs up to a stair case of 45 steps in 9 s. If the height of a 15 cm, find his power.

A man of mass 50 kg ascends 30 steps of a staircase in 15 seconds. If the height of each step of the staircase is 20 cm, find the power of the man (g=9.8 m//s^(2)).

A boy of mass 40 kg climbs up a flight of 30 steps each 20 cm high in 2 min and a girl of mass 30 kg does the same in 1.5 min. Compare : (i) the work done, and (ii) the power developed by them (g = 10 m s^(-2) )

A man raises a box of mass 50 kg to a height of 2 m 10 s,while another man raises the same box to the same height in 50 s. (a)Compare :(i)the work done ,and (ii)the power developed by them . Take g=10 N kg^(-1)