The lenght of a spring varies directly with the mass of an object that it is attatched to. when a 30-gram object is attached the spring stretches 9 centimeters. which equation relates the mass of the object m, and the length of the spring s?

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?