A man of mass 50 kg carries a bag of weright 40 N on his shoulder. The force with which the floor pushes up his feet will be -

A boy carrying a school bag on his shoulder does no work . (Why)

A man of mass 60 kg, carrying a load of mass 40 kg on his head, climbs up a 15 m long staircase to the top of a building 5 m high. What is the work done by the man?

A man of mass 20 kg is carrying a mass of 3 kg on his head. Calculate the work done by the man in moving a distance of 10 m up an incline of 1 in 5 ?

A man of mass 50 kg climbs up a Indder of height 10 m. Calculate : (i) the work done by the man and (ii) the increase in his potential energy (g = 9.8 m s^(2) )

As shown in figure, A is a man of mass 60 kg standing on a block B of mass 40 kg kept on ground. The coefficient of friction between the feet of the man and the block is 0.3 and that between B and the ground is 0.2 . If the person pulls the string with 125 N force ,then

As shown in figure, A is a man of mass 60 kg standing on a block B of mass 40 kg kept on ground. The coefficient of friction between the feet of the man and the block is 0.3 and that between B and the ground is 0.2 . If the person pulls the string with 125 N force ,then

A man (mass =50kg ) and his son (mass =20kg ) are standing on a frictionless surface facing each other , the man pushes his son so that he start moving at a speed of 0.70ms^(-1) with respect to the man. The speed of the man with respect to the surface is:

A man carries a load of 50 kg to a height of 40 m is 25s. If the power of the man is 1568 W, the mass of the man is