Law of Conservation of Energy (Physics) 2. A heavy object is dropped from a vertical height of 8.0 m. What is its speed when it hits the ground? 3. A bowling ball is dropped from the top of a building. If it hits the ground with a speed of 37.0 m/s, how tall was the building? 4. A safe is hurled down from the top of a 1.3 x 10^2? m building at a speed of 11.0 m/s. What is its velocity as it hits the ground? 9. A 2.5 kg object is dropped from a height of 10.0 m above the ground. Calculate the speed of the object as it hits the ground. 10. An 80.0 kg student running at 3.5 m/s grabs a rope that is hanging vertically. How high will the student swing? 11. A pendulum is 1.20 m long. If the pendulum is pulled until it makes a 25.0 angle to the vertical, what is the speed of the pendulum bob when it passes through its equilibrium position? HINT: Determine the vertical drop of the pendulum bob first