Potential energy lets us do work in the present to change things in the future. If energy is currency, then potential energy is money in the bank.

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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