A mass of 10 kg is at a point A on a table. It is moved to a point B. If line joining A and B is horizontal, what is the work done on the object by gravitational force ? Explain your answer.

What is the work done by the force of gravity on a satellite moving round the earth ? Justify your answer.

What is the work done by gravitational force in taking a mass m to a height h with uniform motion?

An object throw at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and final points of the path of object lie on the same horizontal line. What is the work done by the force of gravity on the object.

If (x,y) is any point on the line joining (a,0) and (0,b), show that x/a+y/b=1

A groove is in the form of a broken line ABC and the position vectors fo the three points are respectively 2hati -3hatj +2hatk , 3hati -hatk , hati +hatj +hatk , A force of magnitude 24sqrt3 acts on a particle of unit mass kept at the point A and moves it angle the groove to the point C. If the line of action of the force is parallel to the vector hati +2hatj +hatk all along, the number of units of work done by the force is

A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be