Figure shows a boy on a horizontal platform A on a smooth horizontal surface, holding a rope attached to a box B. Boy pulls the rope with a constant force of 50 N. The combined mass of platform A and boy is `250kg` and that' of box B is `500kg.` The velocity of A relative to the box B 5 s after the boy on A begins to pull ,the rope,will be:

A man pulls one end of a rope attached to a box of mass 5 kg on a smooth horizontal surface with a force of P=10 N horizontally. The mass of the rope = 1 kg. Calculate the force effective on the box.

Three boys are standing on a horizontal platform of mass 170kg as shown in figure. The exchange their position as shown inthe figure. Distance moved by the platform is:

A man pulls a box on a horizontal floor through a distance of 20 m with a force of 30 N applied along a rope tied to the box and making and angle of 60° with the horizontal. Calculate the work done.

A block of mass 48 kg kept on a smooth horizontal surface is pulled by a rope of length 4 m by a horizontal force of 25 N applied to the other end. If the linear density of the rope is 0 . 5 kg m^(-3) , the force acting on the block is

A 50 kg man is standing at the centre of a 30 kg platform A. Length of the platform is 10 m and coefficient of friction between the platform and the horizontal ground is 0.2. Man is holding one end of a light rope which is connected to a 50 kg box B. The coefficient of friction between the box and the ground is 0.5. The man pulls the rope so as to slowly move the box and ensuring that he himself does not move relative to the ground. If the shoes of the man does not slip on the platform, calculate how much time it will take for the man to fall off the platform. Assume that rope remains horizontal, and coefficient of friction between shoes and the platform is 0.6.

A boy displaces a box by applying force of 5 N on it . If work done by boy is 20 j then , what will be the displacement of box ?

A block of mass 10 kg lying on a smooth horizontal surface is being pulled by means of-a rope of mass 2 kg. If a force of 36N is applied at the end of the rope, the tension at the mid point of the rope is,