A lift of total mass `M` is raised by cable from rest through a height `h` . The greatest tension which the cables car safely bear is `n` Mg. The maximum sped of lift during its journey if the ascent is to made in shortest time is

A lift total mass M is raised by cables from rest to rest through a height h. the greatest tension which the cables can safely bear is n Mg. the maximum speed of lift during its journey if the ascent is to made. In shortest time is

A body of mass 10 kg is to be raised by a massless string from rest to rest, through a height 9.8 m. The greatest tension which the string can safely bear is 20 kg-wt. The least time of ascent is

A lift of mass m is supported by a cable that can with stand a force of 3mg. Find the shortest distance in which the lift can be stopped when it is descending with a speed of g/4.

A block of mass 'm' initially at rest is dropped from a height 'h' into a spring whose constant is k. The maximum distance through which the spring is compressed is :

A mass is raised from the surface of the earth to a point which is at a height pR from the centre of the earth, where r is the radius of the earth. Calculation the chagne P.E. If the lifted mass is to be made an artificial satellite of the earth at that distacnce, what is the total work done? Acceleration due to gravity at the suraface of the earth is g.