How much work is required to lift an object with a mass of 5.0 kilograms to a height of 3.5 meters?

Question

anonymous · Answer

The acceleration due to gravity near the earth's surface can be taken as constant. Thus, the gravitational force should also be constant. The work required to do so would be -(work done by gravitational force)
= - (-mgh) [The extra - sign because, the force and displacement vectors are at an angle of 180 degree]
= mgh
Substitute the values m = 5kg, g = 10, h = 3.5, to get the answer.