m above the A sandbag is dropped fro m a hot ai balloon at a height of 12 ground. Find its velocity as it hits the ground. Disregard air resistance. An ironworker drops a hammer 5.25 m to the ground. What is its speed as it hits the ground? A box is dropped 3.60 m to the ground. What is its speed as it hits the ground? A piece of broken glass with mass 15.0 kg falls from the side of a building 8.00 m above the street. (a) What is the kinetic energy of the glass as it hits the street? (b) What is the speed of the glass as it hits the street? 11. A ball is thrown downward from the top of a building at a speed of 75 ft/s. Find its velocity as it hits the ground 475 ft below. Disregard air resistance. 12. Find the maximum height reached by a ball thrown upward at a velocity of 95 ft/s 13. A 4.000-kg mass is dropped from a hot air balloon 300.0 m above the ground. Find its kinetic energy, its potential energy, and the sum of the kinetic energy and the potential energy in 1-s intervals until the mass hits the ground. (Assume no air resistance.) 8. 9. 10. 77

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