**Questions:**

1) What is the potential energy of a 800gm object at a height of 3.2m?

2) What is the kinetic energy of a 50kg child skiing at 36 km/hr?

3) An object with a mass of 0.04kg was dropped from the top of a 75m high building. Calculate the final velocity of the object using the conservation of energy law:

4) A 150gm golf ball had a final vertical velocity of 16 m/s. From what height did the golf ball fall from?