A truck moves on a level road. Doe it do any work against gravity?

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

Why do antibiotics not work against viral infection ?

A road roller takes 750 complete revolutions to move once over to level a road.Find the area of the road if the diameter of a road roller is 84 cm and length is 1 m..

A boy travelling in an open car moving on a levelled road with constant speed tosses a ball vertically up in the air and catches it back. Sketch the motion of the ball as observed by a boy standing on the footpath . Give explanation to support your diagram.

A block of mass 1 kg is pushed up a surface inclined to horizontal at ang angle of 30^@ by a force of 10 N parallel to the inclined surface in the figure. shows . The coefficient of friction between bock and the incline is 0.1. If the block is pushed up by 10 m along the incline, calculate work done against gravity

A person is trying to push a box, the whole day he makes use of his stored energy but cannot move it. In physics we say he has not done any work. Explain why?

Can acceleration be produced without doing any work?