Classical Mechanics
# Potential Energy

An object of mass \(4\text{ kg}\) lies on the ground. If the object is lifted up \(20\text{ m},\) what is the work done by gravity?

Assume that gravitational acceleration is \(g=10\text{ m/s}^2.\)

An object of mass \(9\text{ kg}\) moves on a horizontal floor at \(4\text{ m/s}.\) If the object moves a total of \(50\text{ m},\) what is the work done by gravity to the object?

Assume that gravitational acceleration is \(g=10\text{ m/s}^2.\)

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