What is the work done against gravity when a body is moved horizontally along a frictionless surface ?

Why is the work done against gravity considered negative?

When is the work done by gravity negative ?

What is work done when a body is moving at constant speed over a frictionless horizontal surface ?

When a body is thrown up, work done by gravity on the body is

When a body is thrown up , work done by gravity on the body is

Calculate the work done if a sled is pulled forward 50m along a frictionless surface by a force of 250N at an angle of 60^@ to the horizontal.

What is the work done on a body of mass m moving around a horizontal circle of radius r?

Assertion : The work done in bringing a body down from the top to the base along a frictionless inclined plane is the same as the work done in bringing it down along the vertical side . Reason : The gravitational force on the body along the inclined plane is the same as that along the vertical side.

Calculate the work done by a car against gravity in moving along a straight horizontal road . The mass of the car is 400 kg and the distance moved is 2 m .