Questions 50-59 with work shown.

50. An object has 3000 J of potential energy. How much kinetic energy does it have right before impact? 51. A 100 N rock is moved 15 m in 2 seconds. How much power was exerted? 52. A 500 N-birdbath falls 1.5 m off the back of a tractor trailer. What would be the velocity of the birdbath when it strikes the ground? 53. How much work is done when 75 N of books are lifted 3 m? 54. 600 N Nate climbs 5 m in 10 seconds. How much power does he have? 55. Sally and Melissa try to move their freezer. They both push on itfor 5 minutes. It does not budge. How much work did the girls do? 56. A 30 N book sits on the railing of a deck, which is 5 m off the ground. How much potential energy does the book have? 57. A 90 kg runner runs 10 m/s. How much kinetic energy does he have? 58. A 15kg rock is about to fall off a 60 meter cliff. How much kinetic energy does it have right before impact? What is the velocity of the rock as it lands? 59. Ralph was driving his 2200 kg Nissan Maxima when a car suddenly stopped in front of him causing him to skid into back of that car. The police measured the skid marks to be 38 meters. The braking force for that model of car is 18,500 N. How fast was Ralph going before he applied the brakes