Answers edited by Harry

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• An object falls freely from rest near the surface of earth. What is the speed of the object when it has fallen 4.9 meters from its rest position ?
  
• A building casts a shadow that is 88 meters long. The straight-line distance from the top of the building to the end of the shadow it creates is at a 32° angle with the ground. What is the approximate height of the building?
  
• If a spring has a constant of #4 (kg)/s^2#, how much work will it take to extend the spring by #73 cm #?
  
• Why does a falling object eventually slows down?
  
• What are the units for impulse?
  
• What is angle a?