A body of mass `m kg` lifted by a man to a height of one metre in `30 sec` . Another mass lifted the same mass to the same height in `60 sec` . The work done by then are them are in the ratio.

A body of mass m kg lifted by a man to a height of one metre in 30 sec . Another man lifted the same mass to the same height in 60 sec . The work done by them are in the ratio.

A body of mass 1 kg is lifted through a height of 1m, then its work done is

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)

A body of mass 5 kg is lifted through a height of 20 m. Calculate the work done by the applied force.

A box of mass 10 kg is lifted through a height of 10 m in 49 s. Find the corresponding power.

A box of 50 kg is lifted by a man of mass 60 kg to a height of 50 m. Calculate the work done by the man.