A porter covers a distance of 20 meters on a horizontal platform with a load of mass 50 kg on his head.

How much work is done by a coolie walking on a horizontal platform with a load on his head?

Two persons, A of mass 60 kg and B of mass 40 kg , are standing on a horizontal platform of mass 50 kg . The platform is supported on wheels on a horizontal frictionless surface and is initially at rest. Consider the following situations. (i) Both A and B jump from the platform simultaneously and in the same horizontal direction. (ii) A jumps first in a horizontal direction and after a few seconds B also jumps in the same direction. In both the situations above, just after the jump, the person ( A or B ) moves away from the platform with a speed of 3 m//s relative to the platform and along the horizontal. Final speed of the platform in situation (i), i.e., just after both A and B have jumped will be a.

Two persons, A of mass 60 kg and B of mass 40 kg , are standing on a horizontal platform of mass 50 kg . The platform is supported on wheels on a horizontal frictionless surface and is initially at rest. Consider the following situations. (i) Both A and B jump from the platform simultaneously and in the same horizontal direction. (ii) A jumps first in a horizontal direction and after a few seconds B also jumps in the same direction. In both the situations above, just after the jump, the person ( A or B ) moves away from the platform with a speed of 3 m//s relative to the platform and along the horizontal. Final speed of the platform in situation (ii), i.e., just after B has jumped, will be nearly

Two persons, A of mass 60 kg and B of mass 40 kg , are standing on a horizontal platform of mass 50 kg . The platform is supported on wheels on a horizontal frictionless surface and is initially at rest. Consider the following situations. (i) Both A and B jump from the platform simultaneously and in the same horizontal direction. (ii) A jumps first in a horizontal direction and after a few seconds B also jumps in the same direction. In both the situations above, just after the jump, the person ( A or B ) moves away from the platform with a speed of 3 m//s relative to the platform and along the horizontal. In situation (i), just after both A and B jump from the platform, velocity of centre of mass of the system ( A, B and the platform) is

A car starts from rest and accelerates at a constant rate in a straight line. In the first second, the car covers a distance of 2.0 meters. How much additional distance will the car cover during the second second of its motion ?

A man moves on a straight horizontal road with a block of mass 2 kg in his hand. If he covers a distance of 40m with an acceleration of 1ms^(-2) , find the work done by the man.

A block of mass 20 kg is placed on a horizontal platform and three blocks each with mass 10 kg are arranged as given in figure below. If platform accelerates downward with acceleration 2 m/s^2 , the the normal force between 10 kg and 20 kg block is:

A man weighing 55kg supports a body of 20kg on his head. Calculate work done by him if he moves a distance of 20m(i) on a horizontal road, (ii) upon a smooth incline of 1 in 5. Take g=10ms^(-2)